Giraffes use their extremely long necks to reach the leaves high up on acacia trees, which other animals cannot reach, giving them a food source for which they have few competitors. what can you conclude about natural selection from this observation giraffe necks get longer over a lifetime of stretching, and their offspring inherit the longer necks of their parents. all giraffes are born with short necks and, eating acacia leaves causes them to stretch over a lifetime. other animals will mimic the giraffe and grow longer necks. the giraffes with the longest necks survive and produce offspring

The giraffes with the longest necks survive and produce offspring.

Explanation:

Given the following choices, D is correct:

A) Giraffe necks get longer over a lifetime of stretching, and their offspring inherit the longer necks of their parents.

B) All giraffes are born with short necks, and eating acacia leaves causes them to stretch over a lifetime.

C) Other animals will mimic the giraffe and grow longer necks.

D) The giraffes with the longest necks survive and produce offspring.

nucleus

would be most reasonable answer tbh

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.