Which of the following are most likely to be keystone species in an ecosystem?

A. small-bodied, primary consumers

B. symbionts

C. large-bodied, higher level consumers.

D. producers

Critical concentration is Critical concentration is: a. the concentration of tubulin dimers at which assembly is balanced with disassembly. b. the concentration of tubulin dimers at which assembly occurs primarily. c.

Sally's teacher asked her to classify the organisms in a sample of pond water. Sally believed that they all belonged to the same kingdom but there were both unicellular and multicellular organisms. Sally could be correct.

7. According to the fossil record, which group of organisms has existed for the greatest length of time? (1) gastropods (3) mammals (2) corals (4) vascular plants

Which is a density-independent factor for a flock of Canada geese on a large lake? Question 7 options: dwindling food supply infectious virus intestinal worms unusually cold winter

What is true of the seed coat during germination?

Why fossils are important and why sedimentary rocks have fossils?

Manny has contracted a virus that is destroying his body's immune system. manny most likely has:

When you exercise, your muscle cells use oxygen to convert the energy stored in glucose into the energy stored in ATP, which they then use to drive muscle contractions. When you exercise, your muscles need more oxygen.

Which of these is required for natural selection? A.) All individuals of a population must be identical. B.) There must be a small number of individuals in a population. C.) There must be variation among the members of a population. D.

What process do cells use to make large molecules from smaller molecules?