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"For years, the polar bear has been the symbol of the global warming movement. But today, the American pika has good grounds to compete with the polar bear for this unwanted honor.

American pikas are suffering because global warming has brought higher temperatures to their western mountain homes.

Pikas live in high mountain ecosystems that are cool and moist. Higher temperatures can cause the pikas to overheat.

Unlike other mountain species that can move to higher altitudes in warming climates, pikas live so high on the mountain that there is no where for them to go. Without our protection and help, American pikas could be the first species with the distinction of going extinct due to global warming. We can't let this happen!

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Description

American pikas are small, rodent-like mammals. Although they look like a squirrel or guinea pig, they're actually more closely related to rabbits and hares. Pikas have short, stout bodies with big, round ears. They do not have a visible tail.

Pikas have brown and black fur. The fur is colored to camouflage with rocks. Pika fur is thick to keep them warm in the winter. During the summer, they put on a much lighter coat of fur--however, the fur is still thick enough that a pika might overheat if exposed to very high heat for long periods of time.

Size: Pikas are about 7-8 inches long.

Diet: Pikas are herbivores. They especially love grasses, weeds and tall wildflowers that grow in their rocky, high mountain habitat.

Pikas like to be prepared! In the winter months, there are a lot less grasses and flowers growing in the mountains. To prepare for the lean times, pikas like to save up food during the summer. A pika will collect a pile of extra wildflowers and grasses and lay them out in the sun. The sun's heat dries the plants so they do not get moldy. The plants are stored in the pika's den until winter.

Typical Lifespan: American pikas can live around 6-7 years. Many die after 3 or 4 years.

Habitat

American pikas are found in alpine terrain, above the tree line, on mountains. They live on rock faces, talus and cliffs near mountain meadows. Talus is a rocky area on the side of cliffs, slopes or hillsides.

Range: American pikas live on high-elevation cool mountains west of the Rocky Mountains. They can be found in Montana, Wyoming, Colorado, Idaho, Washington, Oregon, California, Nevada, Utah and New Mexico.

How Pikas Communicate

American pikas are often heard before they are seen. They make calls and sing to define and protect their territory, alert others to the presence of dangers and attract mates. The call sounds like the bleat of lamb, but more high-pitched and squeaky.

Life History and Reproduction

American pikas have adapted to living in very inhospitable environments. They live where most other mammals do not venture to go--the treeless slopes of mountains. It is very cold, rocky and treacherous for the tiny pika.

Pikas help protect themselves by living in colonies. They live near other pikas and will alert the group to predators by sending out a warning call. Weasels, hawks and coyotes can prey on pikas.

Although pikas live in colonies, they are very territorial over their den and surrounding area. They will give off territorial calls to define the boundaries between each pika neighbor. They make their dens among rocks.

Pikas are active in the daytime and they do not hibernate in winter. They are active throughout the year, but they tend to spend most of their time inside the den in the winter. Pikas eat stored grasses to survive and venture out to forage when the weather permits.

In early to mid-spring, American pikas begin to breed. Many pikas breed twice--once in spring and summer. The female is pregnant for a month before giving birth to a litter of 2-6 young. When born, the young cannot function on their own and they depend on their mother for care. It takes about a month for the young to be weaned and 3 months to reach an adult size. After a year, the young develop into breeding adult pikas.

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The habitats of pikas, a small mammal, are limited by various factors like temperature sensitivity, available resources, and environmental conditions. They undergo a concept known as 'range shifts', moving habitats due to changing climate. Their survival can be influenced by the availability of resources, similar to certain butterflies and European bird species.

Pikas, small mammals, are influenced by various environmental and survival factors which limit their habitats. These factors include their sensitivity to heat - small animals like pikas lose heat faster than larger ones, influencing their preference for cooler habitats such as mountains. Additionally, pikas are dependent on specific ecosystem conditions and available resources; a concept known in ecology as range shifts, explained by movement of species habitats due to factors like climate change.

For example, similar to certain European bird species and butterflies like the Karner blue butterfly, pikas might shift their range due to environmental changes. Changes in available resources affect pikas as well, as seen in how the distribution of wild lupines influences the Karner blue butterfly population in oak-pine barren habitats.

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The best description of the endosymbiont/ endosymbiotic theory is the theory that states that Eukaryotic cells derived from a symbiotic relationship with prokaryotic cells. Thus, option A is correct.

Endosymbiotic theory is also known as the symbiogenesis or serial endosymbiotic theory which has been leading the evolutionary theory of the cell which are eukaryotic and they from the prokaryotic organisms.

According to the endosymbiotic theory in the eukaryotic cell some of the cell organelles were once known as the prokaryotic microbes. The size of the mitochondria and chloroplast are of the same size.

Prokaryotic cell are known as the undeveloped and there are not as developed as the eukaryotic cell and they are not advance as the eukaryotic cell and they do not have developed cell organelles with them.

Therefore, The best description of the endosymbiont/ endosymbiotic theory is the theory that states that Eukaryotic cells derived from a symbiotic relationship with prokaryotic cells. Thus, option A is correct.

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yes, for example, an earth quake while devastating can lead to the formation of a mountain or a valley. or a flood can change a landscape in such a way to make it more inhabitable for the local creatures. while natural disasters can help the ecosystem they can also be horrible for them as well.

Yes it can have positive effects.

The biofilm can present one of the most important species of microorganisms, depending on the duration and its location. Gram-positive, Gram-negative and yeast. In addition, the cellular elements may be attached to the biofilm, such as platelets, for example, when the biofilm is installed on the blood-soaked surface.Several factors contribute to the formation of biofilms. The biofilm can present one of the most important species of microorganisms, depending on the duration and its location. Gram-positive, Gram-negative and yeast. In addition, the cellular elements may be attached to the biofilm, such as platelets, for example, when the biofilm is installed on the blood-soaked surface.Several factors contribute to the formation of biofilms, depends primarily on the number and type of cells present in the liquid to which the surface is exposed and the rate of flow of this liquid across the surface. The physical chemical properties of the surface, the nutritional composition and ambient temperature will also interfere with this speed. The presence of antimicrobials in the medium may affect the formation of biofilms.

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Triose phosphate is produced in chloroplasts through the Calvin cycle in photosynthesis. One molecule is exported for other compounds, and the rest are used to regenerate RuBP.

Triose phosphate is produced in the chloroplasts of a plant through the Calvin cycle during photosynthesis. During the regeneration stage of the Calvin cycle, three molecules of triose phosphate are produced from six molecules of G3P (glyceraldehyde-3-phosphate). One molecule of triose phosphate is exported and used in the cytoplasm to form other compounds needed by the plant, while the remaining five molecules are used to regenerate RuBP (ribulose-1,5-bisphosphate), which allows the system to continue fixing carbon dioxide.

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Abiotic Factors of Taiga Biome: The abiotic factors includes temperature, sunlight, soil, air, water. In taiga biome the climate is marked by bitterly cold winter of long duration and cool brief summer season. The winter months are always below freezing point.

2 hours and 42 minutes is 2.7 hours.

You multiply 2.7 x 80, getting 216, so the train traveled

216 miles.

To find the distance a train travels given its speed and time, you use the formula distance = speed x time. The speed here is 80mph and the time, when converted entirely to hours, is 2.7 hours. Therefore the total distance the train travels is 216 miles.

In this question, we are asked to find the distance a train travels in a given time. In mathematics, we can determine this by using the formula for distance which is speed multiplied by time. The speed of the train is given as 80mph. The time is given as 2 hours and 42 minutes. But, as the speed is in mph, we should convert those 42 minutes to hours. 42 minutes is 0.7 hours when converted (since 42/60 = 0.7). So the total time then becomes 2.7 hours (2 hours + 0.7 hours).

Now we can calculate the distance. Distance = Speed x Time,  so Distance = 80mph x 2.7h = 216miles.

So, the train travels 216 miles in 2 hours and 42 minutes.

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it is 33 because you subtract if that is what the question was

Answer:

The correct answer is it has high specific heat capacity.

Explanation:

The amount of heat energy required in joules to raise the temperature by 1 kelvin of a  1 gm substance is called the specific heat capacity. So substance which have high specific heat capacity requires more heat energy to raise their temperature.

Water has very high specific heat capacity due to having lots of hydrogen bonds that are used to make H₂O molecule. So most of the heat energy is used in breaking the hydrogen bonds between the water molecule which restrict the wide change in the temperature of the water bodies.

So high specific heat capacity means more ability to restrict the change in the temperature. Therefore the correct answer is water has high heat capacity.  

Evolution occurs through a process called natural selection. The correct option is c.

Natural selection is the method by which a species adapts to its surroundings. Natural selection causes evolution when individuals with particular traits have a better chance of surviving than those who are not able to adjust to the changes, and these traits are handed on to succeeding generations.

The strongest survive through natural selection, and the most favored traits endure through evolution. (Finches in the Galapagos, as an example. Birds with color preferences for their nests are one example of evolution.

These connected forces changed the genomes of the adapted organisms, giving them specific advantages over the less adapted ones.

Therefore, the correct option is c. Natural Selection.

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I believe its A. Hope this helps !

Answer:

B. deposition

Explanation:

Answer:

B HAVE A GOOD DAY

Explanation:

Answer:

Amylase

Explanation:

1. Sedimentary rock

2. Trace

For number three, I'm sorry, but I'm not sure.

I hope this helped !!

1. Fossils are most often found in sedimentary rock.

2. Any "signs" of past life activity, like footprints or burrows, are called trace fossils.

3. Sharks' teeth and petrified wood are fossils in which organic compounds are replaced by other elements. This process is called mineralization.

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Stress is beneficial because it causes ; ( A ) Increasing energy

Stress is beneficial to the human body in varying ways because stress causes the body to releases certain hormones in response to situations possessing threats to the body.

These hormones leads to increase in heart rate and breathing speed. and this feeds our muscles with the required energy needed to respond to the situation.

Hence we can conclude that stress is beneficial because it causes increasing energy in the human body.

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Answer:

The correct answer is option A, Archaea

Explanation:

The Eukarya domain has four kingdoms primarily - Protista, Fungi, Plantae, and Animalia.

Archaea belongs to the Archaeabacteria kingdom which constitutes of unicellular prokaryotic organsims. In the system of classification , Archaea itself constitutes a domain which is further divided into two subdivisions

a)  Crenarchaeota and  

b) Euryarchaeota

They are unicellular but their characteristics are very different from the bacteria, thus they constitutes an individual set of organisms.

Following is not a kingdom in the Eukarya domain:

A.) Archaea

Eukarya consists of plants, animals, and fungi, as well as protists. Cells have an internal architecture based on the  membranes and DNA is inside a nucleus.

Archaea are single-celled microorganisms with structure similar to that of bacteria. These microorganisms do not have cell nuclei and therefore belong to prokaryotes.   Archaea are anaerobes that is they live in low oxygen environments.

The domain of Eukarya consists of organisms that have a nucleus. Four  kingdoms are : Protista,” Fungi, Plantae, and Animalia. Under the harsh environmental conditions, Archaea contribute to the functioning of the ecosystem by performing functions like nutrient cycling, stress response, and phytohormone biosynthesis.

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Of the following given choices;

I.All cells arise from other cells.

II. All living cells require water for survival.

III. All living things are only composed of cells

The answer is; II and III

While these are also characteristics of cells, cell theory, a historic (17th century)theory, was used proved that cells emanated from other cells. The theory is accredited to Matthias Schleiden and Theodor Schwann. It was a major disapproval from the previously popular theory of spontaneous generation.

The other tenets of this theory include;

All living organisms are composed of one or more cells.

The cell is the basic unit of structure and organization in organisms.

Answer:

The answer is option D.

Explanation:

Populace appropriation implies the example of where individuals live. Total populace dispersion is uneven. Spots which are meagerly populated contain few individuals. Spots which are thickly populated contain numerous people.A inspecting appropriation is a hypothetical dispersion of the qualities that a predefined measurement of an example goes up against in the majority of the conceivable examples of a particular size that can be produced using a given populace. Populace thickness is an estimation of the quantity of individuals in a zone.

Answer:

Rocks can be a physical evidence that shows the earth has changed naturally because most rocks survive for millions of years and you can use this to determine the processes that happened over time.

Explanation:

Answer:

Endocrine system and Nervous system

Explanation:

Endocrine system and nervous system together work to regulate the behaviour of individuals. In general, sex hormones testosterone and estrogen are responsible for gender specific behavioral differences among males and females. The hormones of adrenal gland determine the behaviour of person under stress conditions. Adrenal gland secretes hormones epinephrine and norepinephrine. These hormones target the sympathetic and parasympathetic division of autonomous nervous system to  regulate behaviour of person.

Answer:

endocrine and nervous

Explanation:

The ody ssey ware unit material specifically stated these two only and it was graded correct.

unit 3, assignment 1 under section PHYSIOLOGY. Page 7 of assignment printoff, this answer came from the speaker after the second graphic of the video. and is in the printed transcript of the video.

"Although all organ systems are involved in producing a behavior, the nervous and endocrine systems have the most influence"

And that's what the test wants.

An ecosystem that occurs within shallow tropical waters and supports an abundance of diversity is called a coral reef.

Reefs are frequently referred to as the "rainforests of the sea" due to the richness of life that can be found there. The health of coral reefs is essential for about 25% of the ocean's fish.

A coral reef is an ecosystem that develops in shallow tropical waters and harbors a wide range of species. Coral reefs are some of the most significant and substantial components of the marine environment (they even have an impact on our daily lives).

They offer a variety of marine animals food and shelter, and they help shield our shoreline from major tropical cyclones.

Therefore, a coral reef is an ecosystem that develops in shallow tropical waters and harbors a wide range of species.e correct option is

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Answer: Option B

Explanation:

The normal cells when grown in a nutrient medium starts growing in into the petri dish. The cells keep on growing and when the bottom layer of the plate is filled with the cells then the cells in the petri dish stops growing. This is because the cells observes the contact of one cell with another.

This is known as contact inhibition which does not allows the growth of one cell upon another. Contact inhibition is a part of cell signaling in which there are check points that allows the optimum growth of the cells.

This is a mechanism which helps the cells in optimum growth. This helps in preventing the cell from developing tumor by dividing uninterruptedly.

Option B) Normal cells stop growing in a Petri dish once they cover the bottom due to contact inhibition, where cell-to-cell contact signals them to stop dividing to prevent overgrowth.

Normal cells grown in a Petri dish tend to stop growing after they have covered the bottom of the dish because of a phenomenon known as contact inhibition. Once the cells touch each other, they receive signals to stop dividing. This is a regulatory mechanism that prevents the cells from becoming too dense which could lead to resources depletion and provide a defense mechanism against the potential development of cancerous cells.

It contrasts with cancer cells, which lack contact inhibition and continue to grow and divide, forming multilayered cell clusters.

Therefore. the correct answer is option B) contact with other cells stops cell growth.

1. Neon 2. Water 3. Wood; Out of these 3 substances one is a solid, one a liquid, and one a gas. So going from that, the least organized would be neon since a gaseous substance has particles that have no arrangement . The next water, since it is a liquid with minimal arrangement. The most particle-organized substance would be wood since it is a solid.

Antonie van Leeuwenhoek viewed moving objects from pond water under his microscope and named them “animalcules.

Antonie van Leeuwenhoek was a scientist and the first microscopist to observe protozoa and bacteria. He created microscopes that possess a single high-quality lens of small focal length and isolated tiny animalcules (microbes) from various sources such as pond water, well water and rain water. Through his experiments, he also calculated the sizes of the animalcules.

The opposite of inbreeding would be hybridization, because it consists of two different types of animal conceiving a child.

The opposite of inbreeding is outbreeding, which involves breeding individuals who are unrelated or less closely related. Outbreeding helps maintain genetic diversity and can be achieved through practices such as crossbreeding or bringing in unrelated individuals. Examples of outbreeding can be seen in agriculture where farmers practice outbreeding to improve crops or livestock.

The opposite of inbreeding is outbreeding. Inbreeding refers to the breeding of individuals who are closely related, such as siblings or parent-offspring. In contrast, outbreeding involves breeding individuals who are unrelated or less closely related.

Outbreeding helps maintain genetic diversity within a population and reduces the risk of inheriting harmful traits caused by recessive alleles. This can be achieved through practices such as bringing in unrelated individuals from other populations or species, or practicing crossbreeding between different individuals.

For example, in agriculture, farmers often practice outbreeding to improve crops or livestock by introducing genetic diversity through crossbreeding or selective breeding with unrelated individuals of the same species.

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A probe uniquely hybridizes to a specific target gene due to the principle of complementary base pairing, meaning it only binds to the gene with the exact complementary sequence.

A DNA probe will hybridize to a target gene but not to any unrelated genes because each probe is uniquely matched to a specific target gene sequence. This process takes advantage of the principle of complementary base pairing, where adenine pairs with thymine and cytosine pairs with guanine in DNA sequences. Hence, the probe, which is a short synthetic DNA sequence, will only bind with, or 'hybridize' to, the target gene that has the complementary sequence. For instance, if the probe sequence is AATGC, it will bind to the gene sequence TTACG but not to any unrelated genes with different sequences.

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