Which of the following are narrow blood vessels that restrict blood flow and have thin walls that allow gas exchange?

alveoli veins arteries capillarie

The science for classifying and naming organisms is known as

Most of the carbon on earth is stored in the form of

Which of the following is caused by reproductive isolation within a species? a. a decrease in gene flow b. an increase in genetic flow c. a decrease in genetic drift d. an increase in gene flow