Answer:
When winter arrives availability of food and water decreases so birds travel to warmer places to escape the cold also to survive over there
Explanation:
hope it helps
Pretty sure C
A. Doesn’t make sense bc restriction enzymes cleave dna into fragments
B. PCR is used to identify organisms that are difficult to culture
D. Once again restriction enzymes just cut the dna up
The net force is the vector sum of all the forces that act upon an object. That is to say, the net force is the sum of all the forces,
