which was least likely to have been a component of earths atmosphere before life began?
oxygen
water vapor
carbon dioxide
sulfur
Answer:
oxygen
Explanation:
Earth's early atmosphere before life began was devoid of oxygen. Intense volcanic activity occurred for around a billion years and the earth's surface was in molten state. When it started to cool early atmosphere was formed from the gases emitted by volcano. It contained carbon dioxide, methane, hydrogen sulphide, ammonia and small amounts of water vapor. But this atmosphere had no trace of oxygen.
The water vapor condensed and formed oceans. Photosynthesis by early plants finally released oxygen which became a part of atmosphere. Carbon dioxide was also used up in various cell processes and trapped in rocks and fossil fuels which decreased its share in atmosphere.
The respiratory exchange ratio (rer) is a way of determining the body's metabolism of:
in the late 1950's a woman named velma b. johnston, nicknamed _____, petitioned congress to stop the cruel treatment of the wild burros and horses,
Waves break on a beach due to:
1 turbulence near the shoreline
2 reducing depth of water near beach
3 increasing wavelength near beach
Answer:
The answer choice to the statement: Waves break on a beach due to:___ would be: 2. Reducing depth of water near the beach.
Explanation:
The reason why a wave ends its forward momentum as it reaches land, has to do with the amount of space between the ocean floor that starts diminishing and the water that is moving forward. As land starts to become an obstacle for the speed of motion of the water that was coming in, the more land the incoming water encounters, the slower its motion, until suddenly, the motion stops. This is called the breaking of the waves, and it stops water from moving inland further than it has to. This will change if the ratio of water vs land obstacle is overcome, as is the case of a high tide.
Answer:
It would be number 2
Explanation:
Compared with nuclear families, extended families typically _____.
Answer:
The correct answer would be - include grand parents or two or more blood related adults.
Explanation:
A nuclear family is a family that base on a single married couple and their children. It consist only one couple and their children. It is an ideal family as it support children to get stability and strength from both parents and ease. Extended family consist two or more adult couple related by blood or marriage such as grand parents or uncle and aunt.
Thus, the correct answer would be- include grand parents or two or more blood related adults.
Suppose that you set up a potometer with a bean seedling that is badly wilted. its leaves are wrinkled and drooping. over the course of 30 minutes you observe that the leaves expand and return to an erect state. you also record a drop of 0.54 ml in the pipet of the potometer. is this an accurate measure of the amount of water transpired by the seedling? explain your answer.
Does an earthworm have an open or closed circulatory system explain
Earthworms have a closed circulatory system.
In a closed circulatory system, blood is contained within vessels and pumped by the heart through the body, allowing for efficient distribution of oxygen and nutrients to tissues and the removal of metabolic wastes. Earthworms have a network of blood vessels called capillaries that exchange gases, nutrients, and wastes with surrounding tissues. The blood is pumped by a series of muscular vessels called aortic arches. This closed system helps maintain blood pressure and allows for more efficient oxygen delivery compared to an open circulatory system, where blood bathes the tissues directly.
explain why the risk factors for heart disease and strokes are similar
Explain how you and a friend could be exposed to the same microbes and only one of you becomes sick.
One is probably because your friend has a stronger immune system than you and is able t fight the bacteria infection. The other is probably that your friend is also infected but does not show any symptoms of the infection, in what is referred to as latent infection. The bacteria enters a lysogenic cycle in your friend’s body rather than the more virulent lytic cycle (that happens to you).
An object will absorb all colors of light except for the color that it appears to be.
A client has received a diagnosis of portal hypertension. what does portal hypertension treatment aim to reduce? select all that apply.
Solar cells have many advantages. what is not one of these?
Why is it important to know the background and projected extinction rates for global species?
Post-lab questions: define blood pressure: pressure of the blood in the circulatory system. identify what measurement is used to study blood pressure: mmhg what are the names of the instruments used to measure blood pressure: 1) sphygmomanometer 2) stethoscope the greatest force of the blood against the walls of the arteries during ventricular contraction is called: systolic pressure the constant pressure in the walls of the arteries is called: diastolic describe the normal ranges for each type of blood pressure measurement: 1) 2) if you can palpate a radial pulse from your partner. their bp is at least 80 . if this was not present, but they had a femoral pulse, their bp is 70. if neither was present, but they had a carotid pulse, their bp is 60. if there is no pulse, they are dead. what are the four main factors that influence blood pressure? 1) 2) 3) 4) describe the three factors that may increase blood pressure. 1) 2) 3) describe the three factors that may decrease blood pressure. 1) 2) 3) what other factors may cause miscellaneous readings of blood pressure? 1) 2) how is the blood pressure recorded? identify two types of blood pressure cuffs. 1) 2) describe the exact location you should place the blood pressure cuff. in what direction should the earpieces of the stethoscope be pointed? is having high blood pressure good or bad? why? please explain your thoughts. is having low blood pressure good or bad? why? please explain your thoughts.
Where did the water on Earth come from?
A. mainly volcanic eruptions
B. probably from a combination of sources
C. probably from the nebula that formed the planet
D. mainly comets and asteroids
!SCIENCE!
7. carbon dioxide is a colorless odorless gas why is it considered a pollutant?
A. it gets into natural waters and kills fish
B. it promotes algal growths in natural waters
C. it causes respiratory illness in humans
D. it increases the warming of the atmosphere
Because D, it warms the atmosphere and pokes holes in the ozone layer.
The nurse is developing an educational program about prostate cancer. the nurse should provide information about which topic?
The parents of a school-aged child with cystic fibrosis tell the nurse that they have changed to natural pancreatic enzymes because of money issues. what is an appropriate response by the nurse?
The Atlantic Ocean gets about 3-5 ______ wider each year.
3 to 5 centimeters per year is a good average to use for the Atlantic Ocean. Spreading in the Pacific is faster.
We can tell from their structure that fatty acids are a good source of energy because of:
Why does increased global movement of people increase the risk for pandemic flu? A-It decreases the population densities of urban areas.
B-It increases the transmission of flu between countries.
C- It decreases the responsiveness of national government.
D- It increases the evolution of treatment resistant flu virus.
In the initial period of learning, ________ describes when an organism learns to connect a neutral stimulus and an unconditioned stimulus. acquisition conditioning extinction neutral stimulate
Answer:
Option A, Acquisition
Explanation:
The first stage of learning is known as acquisition. It causes establishment of responses by pairing of Neutral stimulus, conditioning and un-conditioning stimulus. Once the association between a neutral stimulus and conditioned stimulus is established, the responses are acquired.
For example – If a bird is trained to pick a key whenever there is a sound of a bell, then after certain period of time an association will be established between the “ringing of bell” and “picking up of key” activity. Therefore, whenever the bird will hear the ringing sound it will search for key to be picked.
Thus, option A is correct.
In the initial period of learning acquisition helps an organism to learn to connect a neutral stimulus and an unconditioned stimulus.
Further Explanation:
Stimulus is anything that induces any particular working reaction in an organ or the tissue.
An unconditioned stimulus elicits the unlearned response and an unconditioned response is the naturally occurring response
Classical conditioning is a kind of learning wherein a subject starts to respond to neutral stimulus as it would do to another stimulus by learning the way to connect the two stimuli
Acquisition can be defined as the duration of learning in Classical conditioning where human or any other animal starts to link a neutral stimulus and an unconditioned stimulus which allows the neutral stimulus to start exhibiting the conditioned response.
Extinction can be defined as the progressive weakening and eventually fading of the conditioned response.
Neutral stimulus can be defined as the stimulus which before conditioning do not produce any specific response.
Conditioned stimulus are the neutral stimulus that starts eliciting a conditioned response once it pairs with an unconditioned stimulus.
Learn more:
1.Learn more about memory https://brainly.com/question/2034996
2. Learn more about animal https://brainly.com/question/10208427
3. Learn more about human https://brainly.com/question/4674681
Answer Details:
Grade: College biology
Subject: Biology
Chapter: Learning and memory
Keywords:
Stimulus, organ, tissue, unconditioned stimulus, acquisition, animal, neutral stimulus, conditioned response, extinction.
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The partial pressure of oxygen inside the lung (alveolar air) is usually _________ kPa and the partial pressure of oxygen in the adjacent pulmonary blood is ________ kPa.
Answer:
104 mm Hg 100 mm Hg
Explanation:
What are the four different type of bases in DNA and how do they pair
What compound is produced during regeneration?
1.
Viruses (1 point)
have large central nuclei.
vary greatly in size and structure.
rarely contain DNA or RNA.
can be seen with a basic compound light microscope.
Answer:
Answer is B.
Explanation:
Gel electrophoresis separates dna fragments according to their ________.
Gel electrophoresis separates DNA fragments according to their size. Nucleic acids are loaded into a gel matrix and an electric field moves them, with smaller fragments moving faster than larger ones, creating separation.
Explanation:Gel electrophoresis is a technique commonly used to separate biological molecules, particularly DNA fragments, based on their size. The process involves loading nucleic acids into a slot near the gel's negative electrode. Due to the negative charge of nucleic acids at neutral or basic pH in an aqueous environment, an electric field can mobilize them towards the positive electrode at the opposite end of the gel.
Size separation occurs due to the gel's porous matrix: smaller fragments move faster through the pores than larger ones, thus, creating a separation. This concept is visually manifested on the gel as bands at specific distances from the top, with each band representing DNA fragments of a particular size. A mixture of fragments varying in size may appear as a long smear, while uncut genomic DNA is often too large to run through the gel, creating a single large band at the top of the gel.
Learn more about Gel electrophoresis here:https://brainly.com/question/33515932
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According to the cladogram, which characteristic was used to separate bony fish from amphibians?
A. jaws
B. cartilage
C. bony skeleton
D. lungs
Answer:
(D). lungs
Explanation:
Cladograms are diagrams that show cladistic relationship between organisms of different species on the basis of their characteristics. The cladograms may include characteristics to make two organisms different from each other.
In given cladogram, characteristic that separates bony fish from amphibians is 'lungs', as lungs are absent in bony fishes, while present in amphibians.
Thus, the correct answer is option (D).
Answer:
(D) . Lungs
Explanation : look above
A client in the intensive care unit (icu) is on a dobutamine drip. during an assessment the client states, "i was feeling better but now my chest is tight and i feel like my heart is skipping." physical assessment reveals a heart rate of 110 beats per minute and blood pressure of 160/98 mm hg. what is the nurse's immediate concern for this client
Foods are broken down into simple molecular subunits for distribution and use throughout the body. which type of simple subunits, listed below, is used preferentially as an energy source?