When a single population evolves into two populations that cannot interbreed anymore ___ has occurred

Which aspects of a region's climate have the most impact on plants and animals?

Siblings will have the same nuclear DNA, but different mtDNA. true or false

Which term describes the process whereby toxic substances increase along trophic levels of an ecosystem?

Explain how early Earth's atmosphere shifted from anaerobic to aerobic.

Which of the body's systems directs and coordinates the interrelated activities of the gastrointestinal tract? Which of the body's systems directs and coordinates the interrelated activities of the gastrointestinal tract?

Identify one factor that could affect which color trait is selected for in a particular environment

Two species of crickets are indistinguishable (identical) to one another except for their mating songs, which have noticeably different pitches. Thus, the crickets will not mate.

How have human activities affected the phosphorus cycle?

Many animals such as goats, deer, and cattle have horns or antlers. What purpose do these structures serve? Question 7 options: They are used for ornamentation and for attracting a mate.

Which of the following is not a characteristic shared by all chordates? fins hollow nerve chord pharyngeal pouches notochord