What can make a species less genetically diverse?

What is the chemical made in the stomach that is not an enzyme? Select one: a. Pepsin b. Pepsinogen c. Bile d. Hydrochloric acid

Echinoderms, like sea stars, have nervous system

The mass extinctions that occurred 250 million years ago and 65 million years ago may have been due to gradual process or?

Scientists discovered a new species of freshwater fish that lives in a pond with a very low O2 level. When they measured the oxygen extraction efficiency of the fish, it was twice as high as that of closely-related fresh water fish.

Use an example to describe the relationship among cells, tissues, organs, and organ systems

What is one evolutionary explanation of culture? Discuss any evidence from the text that suggests one evolutionary reason for the existence of culture.

Which sentence uses an action verb? A. She grew many flowers in her garden. B. Bees are busy insects. C. I am very sleepy today. D. Have you been in the library since noon?

Which is the result of meiosis II? A. two diploid daughter cells B. four diploid daughter cells C. two haploid daughter cells D. four haploid daughter cells

Which of the following best describes evolution? A. Indivuals compete to survive and only change as a result of competetion B. Indivuals with traits best suited osurvival pass these traits to offsprings C.

Biome which is dominated by grass and in which trees are rare