In the last few centuries, the number of species becoming extinct on earth has

a. decreased dramatically

b. decreased slightly

c. increased slightly

d. increased dramatically

Which statement is correct? A. Both animals and fungi lack cell walls B. Both protists and fungi are eukaryotic C. Like some prokaryotes, fungi are autotrophic D. Both plants and fungi undergo photosynthesis

Which of the following is an artifact? bone bowl footprint insect in amber

Which of the following is NOT a function of Earth's atmosphere? A. provides carbon dioxide for plants B. provides oxygen for plants and animals C. keeps volcanoes from erupting too much D. keeps Earth's surface at a comfortable temperature

All of the following are correct comparisons of anaerobic and aerobic respiration except: A. aerobic respiration occurs with oxygen and anaerobic respiration occurs without oxygen B.

What are the largest systems in the mono lake ecosystem? What are some examples of smaller systems within that system?

What type of organic compounds store the most energy? the least?

Why do you think people are willing to accept the costs as well as the benefits of using fossil fuels?

Whose brain would be most plastic? Group of answer choices A 15-year-old athlete A 21-year-old college student A 51-year-old schoolteacher A 5-year-old child

A farmer chooses to breed the cows that produce the most milk rather than the cows that produce less milk. This is an example of

Many protozoa have tiny hair-like structures that beat back and forth to aid a protozoa's movement. What are these hair-like structures called?