Which is a reason that protists are difficult to classify?

They are too small.

They are all eukaryotes.

They have been classified based on what they are not.

They have too many shared characteristics.

An energy pyramid shows that about 90 percent of the energy represented in each trophic level is A. passed on to the level above it. B. used by decomposers. C. lost to the environment as heat. D. recycled by the ecosystem.

Olfactory sensory neurons are short-lived and, therefore, replaced frequently. How does this turnover happen? A. mitotic division and differentiation of supporting cells B. mitotic division of olfactory sensory neurons C.

Which valence have the greatest tendency to form ions? A. + 1 B. - 1 C. + 2 D. - 2 E. + 3 F. - 3 G. + 4 H. - 4

It is crucial that the process of mitosis is error free. This is because otherwise healthy cells can

Though energy cannot be created or destroyed, it can be transferred and transformed. When energy is not in use, it can be stored. Chemical energy is stored in chemical compounds and released through chemical reactions.

Science 6. Is this statement True or False? The gametophyte stage comes before the sporophyte stage. True or False?

What precautions need to be taken when working with a fan propelled car?

Which of the following are items that are a threat to biodiversity? pollution and succession habitat loss and predation poaching and habitat loss succession and pollution

Tectonic plates are made of earth asthenosphere

Photochemical smog tends to form over