Which role of protists has the most positive effect on maintaining the plant population in an ecosystem? A. Protists are a major food source for animals.
B. Protists produce approximately 75 percent of the oxygen on Earth.
C. Protists decompose dead materials, returning nutrients to the soil.
D. Protists found in the gut of animals assist in digestion.

Select the correct answer.which scenario describes unethical lab behavior? a.danny stores the chemicals required for his experiment in flasks and beakers.b. anna publishes the results of her experiment on the growth rate of saplings.c. jason repeatedly runs an experiment until he gets the results he desires.d. mia records her observations of an experiment precisely and accurately.resetnext

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

Autotrophs a.consume their food to get energy b.may use photosynthesis to gain energy c.are also called consumers d.cannot use solar energy