Which of these is a common characteristic of cnidarians?

a. they have four legs.

b. they have tentacles with stinging cells.

c. they live only in the oceans.

d. they live only at the surface of the water.

This is a coral reef ecosystem. many biotic and abiotic factors affect the health of this ecosystem. which set correctly pairs a biotic factor and an abiotic factor?

Food provides molecules that serve as fuel and building material for all organisms. plants undergo photosynthesis and make their own food. other organisms, like us and the horse seen above, are consumers and eat food. how do all organisms use food as fuel? be sure to include the name of the process in your answer. me.

What is the relationship between absorbance of light and the rate of photosynthesis?