An ecological numbers pyramid illustrates population sizes within an ecosystem. Based on the pyramid, which type of organism would be least abundant in most ecosystems?

In a scientific experiment how many independent variables should be tested at the same time

1. Which species is most vulnerable to extinction? Give at least 3 reasons why and explain.

Explain why some people are naturally resistant to infection by the virus that causes fifth disease

According to some scientists, what resulted from the environmental conditions existing on primitive earth illustrated above?

A cell cluster with both algal and hyphal cells that is used for asexual reproduction in lichens is called aNo __. Select one: a. soredium b. thallus c. sporangium d. arbuscule e. haustorium

What is the name of the process cells membrane pinching in the center to form two daughters cells

Which of the following is an example of an organism maintaining homeostasis? 1. A cat grooming itself 2. A bear nursing her cubs 3. A man sweating while he runs 4. A boy riding a bike

Which of the following is a characteristic of lipids? (Choice A) AThey are composed of nitrogenous chains. (Choice B) BThey are not soluble in water. (Choice C) CThey are either fats or oils. (Choice D) DThey are polar molecules.

A 3-month-old infant hospitalized with severe diarrhea has excoriated skin in the diaper area. the parents become concerned when they discover that the nurse has left the infant without a diaper. what is the nurse's explanation for this action?

Which of the following is an abiotic factor of an ecosystem? A. weeds B. a rabbit C. soil D. a snake