Answers
Related Questions
How are pollen and egg cells different than most other plant cells?
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Answer:
Fertilization, which is the union of sperm and egg, occurs deep within the flower after pollination. When a pollen grain lands on the stigma, it generates a tiny tube tipped with sperm. The tube fits into a conduit called a style in the female pistil.
Explanation:
Pollen grains and egg cells differ from most plant cells by being specialized haploid gametophytes with features that ensure successful fertilization and seed formation for plant reproduction.
Pollen grains and egg cells, which represent the male and female gametophytes respectively, differ from most other plant cells in several ways. Pollen grains are male gametophytes containing a few cells and are specialized for transport to female reproductive organs. This is possible due to features like a protective coat that prevents desiccation, and, in some cases, structures such as air sacs that facilitate their movement towards the ovule. The whole structure is adapted to ensure successful fertilization without dependence on water. Egg cells are found within the female gametophyte, which also contains additional cell types like the synergids and antipodal cells.
The key characteristic of pollen and egg cells is their ploidy level: they are haploid (1n), containing a single set of chromosomes, unlike the diploid (2n) cells found in most of the plant body (sporophyte generation). This difference is crucial for sexual reproduction, as the fusion of a pollen grain’s sperm cell with an egg cell will result in a diploid zygote, from which a new sporophyte will develop. Seed formation then follows, encapsulating the zygote to provide protection, nourishment, and a mechanism for dormancy until growth conditions are optimal.
After a major fire, grasses that are pioneer species start to grow in the ashy soil. The following list includes some of the ways that the grasses affect the ecosystem.
absorbing nutrients from the soil
absorbing water from the soil
providing food for animals
preventing erosion
Which of the items on the list contribute to ecological succession in the burned area?
A.
absorbing nutrients from the soil and absorbing water from the soil
B.
absorbing nutrients from the soil and providing food for animals
C.
preventing erosion and absorbing water from the soil
D.
preventing erosion and providing food for animals
Answers
Answer:
D
Explanation:
It seems like that helps start it up. Not sure but hope it helps!!
Answer:
d its right
Explanation:
can the behavior of a material of substance be considered a physical property
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Answer:
Physical properties are those attributes of a material that can be observed and/or measured without changing the composition or identity of that material. Examples of such properties include color, smell, freezing point, melting point, viscosity, opacity. density, solubility, polarity, texture and many others.
Now if the behavior of a material is inherent to that material, and is an attribute that can be observed or measured without effecting any chemical change in that material, then it may very well be considered a physical property of that material.
For example if a particular element or material melts at 40 degrees centigrade, this is a behavior of that element and is considered a physical attribute.
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Explanation:
What does each branch in a cladogram represent?
A different ancestral trait
O
B. A different derived trait
c. A different common ancestor
D. A different outgroup
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AnswerB. I think,Plus is it helpful?
Explanation:
The branch of the cladogram represents different out-groups. Therefore, option "D" is correct.
What is a cladogram?A cladogram represents the phylogenetic relationship between organisms that share the same ancestors. The parts of a cladogram a root, nodes, clades, taxon/ out groups, and branches.
Roots in the cladogram represent the main ancestor of all the organisms. It is the initial organism from which other organisms were evaluated. Nodes represent the first organism that evolved from the ancestor. It is the starting point of divergence. Clade represents a group of evolved organisms whereas the taxon represents distantly related organisms.
A cladogram helps in the identification of the ancestors from which a particular group of organisms is outgrown.
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1 point
Fungi used to be classified in the same kingdom as plants. In time,
scientists observed a key characteristic that required reclassification. What
was that characteristic? *
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Final answer:
Fungi were once classified as plants, but scientists observed a key characteristic that required reclassification. The cell walls of fungi are made of chitin instead of cellulose, and fungi absorb nutrients from other organisms.
Explanation:
Fungi were once classified as plants due to their similarities with plants such as immobility, having cell walls, and growing in soil. However, scientists observed a key characteristic that required reclassification: the cell walls of fungi are made of chitin instead of cellulose, which is found in plant cell walls. Additionally, fungi absorb nutrients from other organisms, while plants can make their own food through photosynthesis.How does climate change threaten food availability for a growing population
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PLEASE HELP 58 POINTS I WILL THANK & GIVE BRAINLIEST TO QUICKEST ANSWER!!!!!!!!
In your own words, write a paragraph that explains how evidence of evolution since Darwin’s time has strengthened his theories. Please include the following:
Use our previous discussions, power points, khan academy and learning.
Describe how natural selection supports or refutes Darwin’s theory of evolution.
Describe how the fossil record supports or refutes Darwin’s theory of evolution.
Describe how embryology supports or refutes Darwin’s theory of evolution.
Describe how analogous and homologous structures support or refute Darwin’s theory of evolution.
You may also use reputable research.
Please cite your findings. Please include your links at the bottom of the assignment.
Answers
Answer:
In biology it refers to observed changes in organisms, to their descent from a common ancestor, and at a technical level to a change in gene frequency over time; it can also refer to explanatory theories (such as Charles Darwin's theory of natural selection) which explain the mechanisms of evolution. Natural selection
There are two major components to the theory. The first is the mechanism of natural selection, which was proposed independently by Charles Darwin and Alfred Russell Wallace in 1858.
In the same way artificial selection occurs when breeders choose seeds or studs that will improve their stock in the next generation, natural selection is the process of sorting living things according to how well adapted they are to their environment.
In the case of artificial selection, humans choose which traits are desirable. In the case of natural selection, traits that increase the likelihood of survival and reproduction will become more common within a population or species over time.
In the past, natural selection has been misrepresented by calling it the survival of the fittest. This statement oversimplifies the mechanism by making it sound like a tautology: the survival of those who survive.
The truth is that individuals never survive. What survives is the process for making another individual, and this resides in genes found in populations.
Natural selection has more to do with differential reproduction than survival, and what it selects are the genes that code for desirable traits or characteristics. The interaction of individuals with their environment provides a mechanism for sorting out which traits (not which individuals) will be passed on to the next generation.
Nature of inheritance
The second major component to the theory is the nature of inheritance, which follows the insights made by Gregor Mendel in 1865 and has advanced considerably since then due to our understanding of genes, DNA and the molecular processes of life.
When natural selection was first formulated by Darwin, the nature of inheritance was not understood. Our current understanding of inheritance is very sophisticated and includes the precise mechanisms for passing genes on to the next generation, how genes are modified by mutation and how they are shared among sexual species.
If we know enough about a gene and its various forms, it is possible to accurately predict the change in the frequency of those genes over time using mathematical formulae from population and evolutionary genetics theory.
This alteration of gene frequencies is subtle and does not, at first glance, seem worthy of being called evolution. But it is precisely these small changes at the genetic level that lead to large changes in the organisms that carry them.
The sorting of genes affects the fate of populations: populations drift apart and become species, and species diverge to create whole groups of plants or animals that dominate the landscape for millions of years.
The intricate details of cellular processes are responsible for the glorious and majestic diversity of life on our planet.
The theory of evolution includes large changes over vast periods of time and tiny changes made when one cell divides into two.
These processes form a continuum that is the history of life on Earth
Answer:
If we know enough about a gene and its various forms, it is possible to accurately predict the change in the frequency of those genes over time using mathematical formulae from population and evolutionary genetics theory.
This alteration of gene frequencies is subtle and does not, at first glance, seem worthy of being called evolution. But it is precisely these small changes at the genetic level that lead to large changes in the organisms that carry them.
The sorting of genes affects the fate of populations: populations drift apart and become species, and species diverge to create whole groups of plants or animals that dominate the landscape for millions of years.
According to natural selection, what environmental factor caused the beaks of the
finches to be different on each island? (Weather, Predators, Food Source, or Disease)
Answers
Answer: I think the right answer would be food source because in a island food source aren't the same with them in another land
Explanation:
Which of the following environmental changes would increase the stability of an ecosystem?
A. A reduction of resources that increases completion.
B. An expansion of available land and increased biodiversity.
C. Introduction of a predator that preys on specific populations.
D. Climatic changes alter the length of a growing season of plants.
Answers
Answer:
Would be option B. An expansion of available land and increased biodiversity
(Sorry if it's incorrect)
Explanation:
A. would be wrong because it would de decrease this ability of an ecosystem, so that's wrong.
B. would be right because It will increase the amount of wilderness which would help the ecosystem.
C. would be wrong because it would decrease the amount of natural animals in the area.
D. would easily be wrong because it would It would affect the growing rate of the plants and could kill them, which would affect the animals, overall affecting the nearby ecosystem.
So, at least you with option B as being correct.
Answer:
B. An expansion of available land and increased biodiversity
Explanation:
Because if we expand the land for biodiversity that is plants and animals to thrive, than the stability of ecosystem will increase.
pros and cons about georthermal technology
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Answer:
i think
Explanation:
bc i know
Efficient (300- 500% compared to 90% of the best furnaces). Electricity is still needed to operate heat pumps.
Geothermal energy is a renewable resource as long as the Earth exists. Geothermal energy using wells requires an incredible usage of water.
which is the best definition for the underlined word _transformation ______________
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Answer:
The genetic alteration of a cell resulting from the direct intake, placement and expression of exogenous genetic material from its surroundings and taken in through the cell membrane
Explanation:
Answer:
a thorough or dramatic change in form or appearance
Explanation:
Abiotic factors that characterize a forest ecosystem include? Which one
•light and biodiversity
•pH and the number heterotrophs
• temperature and amount of available water
•type of producers and decomposer
Answers
Temperature and amount of available water.
Abiotic: a non-living factors that affect organisms and their ecosystem. Can be a physical or chemical part.
Temperature and water as we know, are not living (biotic) components.
The most important abiotic factor of a forest ecosystem is temperature and the amount of available water as these directly affect the resources and climate. Thus option C is correct.
What are biotic and abiotic factors?The forest ecosystem is made up of two components that decide the characteristics of the forest. The tropical rainforest has a constant temperature and high amount of precipitation.
one is abiotic which is the non-living like air, temperature, and rain and the other is biotic factors which are the living parts like animals, and birds, plants, and decomposers.
Temperature and water control the habitat of animals and these are abiotic factors and have a direct effect on the ecosystem of forests. So option C is correct.
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Each year as the weather gets cold, gray whales swim over 10,000 miles from arctic waters south to coastal areas of northern Mexico. After their young are born, they return to the Arctic.
The whales are responding to an stimulus_______.
This response is an example of _______.
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Answer:
External, Migration
Explanation:
just trust me
Answer:
external, migration
Explanation:
Just answered it.
explain how oxygen and nutrients are transported by ocean currents
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Answer:
Currents play a huge role in marine productivity, through a process called upwelling. ... When currents upwell, or flow up to the surface from beneath, they sweep vital nutrients back to where they're needed most. Nowhere is the link between ocean circulation and productivity more evident than around Antarctica.
Explanation:
Deep ocean currents are a result of:
A) Density
B) Earth’s Rotation
C) Global Wind Patterns
D) All of the above
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Just need to match these I posted this question and accidentally put the subject as Spanish
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Answer:
1. nonliving matter that living organisms need to survive
2. bacteria
3. plants
4. animals
Explanation:
____________________ is a relationship between two organisms in which ONE species benefits by hunting, killing and eating the other organism.
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Earth’s path around the sun is ____________. Which word best completes the sentence? triangular elliptical random circular
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Answer:
i think the answer would be circular.
Explanation:
because it moves around the sun in a circle.
Answer:
elliptical
Explanation:
How can substances be transported across a membrane against their concentration gradient?
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Answer: To move substances against a concentration or electrochemical gradient, a cell must use energy.
Explanation:
This occurs because During active transport, substances move against the concentration gradient from an area of low concentration to an area of high concentration which is a “active” progress which requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.
Substances can be moved across a membrane against their concentration gradient using active transport. It requires ATP energy and uses proteins in the cell membrane as pumps.
Explanation:Substances can be transported across a membrane against their concentration gradient through a process called active transport. In this process, substances move from an area of low concentration to an area of high concentration, which is against the natural diffusion process. Some substances cannot pass through the cell membrane passively and for these, the cell uses active transport which requires energy, usually in the form of ATP (Adenosine Triphosphate). Proteins in the cell membrane, called transport proteins or pumps, are utilized to push these materials against their gradient.
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Organisms that are responsible for talking in light energy to make their own food area know as which of the following ?
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4. Which describes all of the organisms shown
in the food web? SC.6.L.14.2
A unicellular
B multicellular
C producer
D consumer
NEED ANSWERS ASAP!!
Answers
All organisms in a food web can be described as consumers, as this term encompasses all levels from primary to quaternary consumers, unlike producers which only refer to the base of the food web.
Explanation:The original question asks to describe all of the organisms shown in a food web. To answer this question accurately, we must consider the characteristics shared by each organism within the web, spanning from producers to quaternary consumers.
The correct answer is D. consumer, as this term includes all organisms that rely on consuming other organisms for energy, encompassing primary, secondary, tertiary, and quaternary consumers. Producers, which are typically photosynthetic organisms like plants or phytoplankton, form the basis of food webs by producing organic compounds from inorganic sources.
However, the question asks for a description that applies to all organisms within the web, making consumers the correct choice since they make up the majority of any food web, relying on other organisms for energy and nutrients.
What is the current theory about the formation of the solar system?
I need a answer ASAP!!! My test is TIMED
A big bang occurred in the solar system as a result of a fusion reaction. All the matter in the solar system that had been clumped together was shattered and sent flying. As new pieces of matter connected, all the celestial bodies of the solar system were formed.
The solar system began as a cloud of dust and gas that condensed, forming a bulging middle and an outer disk. The bulging middle of the cloud became the sun, and the rest of the dust and gas formed the planets, orbiting the sun in the same plane.
About 14 billion years ago, several supernova events scattered all the known elements throughout the galaxy. The magnetic elements were attracted to each other and formed the early celestial bodies that eventually became the planets of the solar system.
The area of the universe that was to become the solar system went through a period of vast expansion as a result of rapid radioactive decay that left behind clouds of dust and gases. The excess clouds and gases were used to form the various parts of the solar system.
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Answer:i cant tell you the answer dont want to give you wrong
Explanation:
A triangle points down, 25 is below the triangle, 5 is to the right of the triangle, one dot and 26 is above the triangle. Next to the triangle is a solid circle with a single white line down the middle. Lines in the shape of an F extend from the top of the circle, slightly left of the white line. 1010 is to the right with negative 6 below it. Fill in the blank to complete each statement. The air pressure is millibars. The temperature is degrees. The dew point is degrees
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Answer:
1010
26
25
Explanation:
Answer:
1,010
26
25
Explanation:
Taking the assignment rn
you people have a nice day alright?
Which is a reflex response?
A) putting on a coat when you see that it is snowing outside
B) pulling your foot away after stepping on a sharp object
C) laughing at a funny joke told by one of your classmates
D) eating a snack when your stomach growls from hunger
Help heh:)
Answers
Answer:
Pulling your foot away agter stepping on a sharp object
Answer:
B) Pulling your foot away after stepping on a sharp object
Explanation:
Structures for protection to the environment is an example of
Answers
Answer: a protective wall and a dam
Explanation:
How do human activities cause pathogens to move from one species to another? Give an example of cross-species transfer to help explain your answer?
Answers
The way in which humans are altering the envrionment is one of the main reasons why pathogens move from one species to another. The emergence of hemorrhagic fever in Argentina is an example of how human change to the environment has caused a cross-species transfer.
PLEASE HELP QUICK I GIVE 20 POINTS!!
The Plant Cell
function for each organelle?
organelle:
golgi complex
nuclear membrane
nucleolus
The Animal Cell
function for each organelle?
organelle:
cytoplasm
golgi complex
lysosome
rough endoplasmic reticulum
smooth endoplasmic reticulum
Answers
Nuclear membrane- The nuclear membrane keeps DNA inside the nuclear and protects it from materials in the cytoplasm.
Nucleolus- The nucleolus makes ribosomal submits from proteins and ribosomal RNA. (Makes proteins in the cell)
Animal Cells:
Cytoplasm- Cytoplasm is responsible for giving the cell its shape and keeping the organelles in their place.
Golgi complex- The Golgi complex processes and bundles macromolecules.
Nuclear membrane- The nuclear membrane is a double membrane layer that separates the contents of the nucleus from the rest of the cell.
Nucleolus-The nucleolus plays a vital role in making proteins in the cell.
The Golgi complex is involved in modifying and packaging proteins and lipids in both plant and animal cells. The nuclear membrane regulates substance flow in and out of the nucleus, and the nucleolus assembles ribosomes in plant cells. In animal cells, the cytoplasm provides medium for reactions, lysosomes digest waste, RER synthesizes and modifies proteins, and SER synthesizes lipids and stores calcium ions.
Explanation:The functions of the organelles you've inquired about are crucial for the life of the cell. In a plant cell, the Golgi complex modifies, sorts, and packages proteins and lipids for storage or transport out of the cell. The nuclear membrane, also known as the nuclear envelope, encloses the nucleus, providing a barrier that regulates the flow of substances into and out of the nucleus. The nucleolus within the nucleus is responsible for ribosome assembly, which are then transported out to the cytoplasm for protein synthesis.
In an animal cell, cytoplasm is the gel-like substance enclosed within the cell membrane, providing a medium for chemical reactions and helping to support the cell's structure. The golgi complex functions similarly to that in plant cells. Lysosomes contain digestive enzymes that break down waste materials and cellular debris. The rough endoplasmic reticulum (RER) is studded with ribosomes and is the site for protein synthesis and modification, while the smooth endoplasmic reticulum (SER) is involved in the synthesis of lipids, detoxification, and calcium ion storage.
The Himalaya mountains formed from the collision of the India plate and Eurasian plate each carrying continental crust. what type of mountains are the Himalayas?
Answers
Answer:
Fold Mountains
Explanation:
"The rugged, soaring heights of the Himalayas, Andes, and Alps are all active fold mountains." - google
Answer:The Himalayan mountain range and Tibetan plateau have formed as a result of the collision between the Indian Plate and Eurasian Plate which began 50 million years ago and continues today. 225 million years ago India was a large island situated off the Australian coast and separated from Asia by the Tethys Ocean.
Explanation:
Which of the following is true about reproduction in flowering plants?
Answers
Answer:
C. asexual
Explanation:
flowers can not reproduce by sexual means because they can't move around
mark me brainliest please
Answer: Flowering plants reproduce by sexual reproduction
Which of the following supports the argument that genetic selection improves animal welfare?
Genetic selection can alter physical traits.
Genetic selection can boost food production.
Genetic selection can produce heartier crops.
Genetic selection can modify aggressive behaviors.
Answers
Answer:
it would be the first one
Explanation:
because the other ones talk about food, crops, and behavior.
Answer:
The CORRECT answer is "Genetic selection can modify aggressive behaviors."
Explanation:
trust.