Natural selection ________.

A) results in evolutionary adaptation
B) is a very rare phenomenon
C) does not affect allelic frequencies
D) prepares organisms for future changes in the environment


A) results in evolutionary adaptation

Biology & Microbiology

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It appears that eukaryotic diversity took off around 800 million years ago. Which of the following is thought to be responsible for this?

A. By 800 million years ago, enough time had passed since the arrival of eukaryotes for evolutionary adaptation to take place. B. Eukaryotic organisms first arrived 800 million years ago, so when they did, they quickly diversified. C. Chloroplasts first arrived 800 million years ago. D. Environmental conditions changed 800 million years ago, namely an increase in oxygen and a decrease in sulfide. E. All of the answer options are correct.

Biology & Microbiology

Population size depends upon

a. deaths. b. births. c. migration. d. immigration. e. all of these.

Biology & Microbiology

Somatostatin functions to inhibit both insulin and glucagon

Indicate whether the statement is true or false

Biology & Microbiology

The light reactions occur in the:

A) stoma. B) thylakoid compartment. C) mitochondrial compartment. D) mitochondrial membrane. E) thylakoid membrane.

Biology & Microbiology