Sugar and phosphate makeup the backbone/ and or side pieces of the dna molecule.
Answer:
A shortage of nutrients would cause sickness and death to organisms in an ecosystem.
Explanation:
When nutrients are scarce, organism populations decline; when they are substantial, those populations increase.
Answer: In his experiment, Pavlov used a metronome as his neutral stimulus. By itself the metronome did not elicit a response from the dogs. Next, <u>Pavlov began the conditioning procedure, whereby the clicking metronome was introduced just before he gave food to his dogs.</u>
Answer is A.
:)
<h2>Answer:</h2>
The great genetic and phenotypic diversity among humans is due to crossing over during meiosis in the human population.
<u>If crossing over does not happen in meiosis then, there will no genetic and phenotypic diversity in humans.
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In simple words, the faces and traits will reappear in generations.
<h2 />
2nd one is the right answer
