Assuming the carbon cycle is a closed system, which of the following statements is true? a. the sun absorbs energy from the carbon cycle. b. when all the fossil fuels are used up, there will be no more carbon. c. mass and energy are conserved in the carbon cycle. d. as population sizes increase, more carbon is produced.

Asmall number of finches are removed randomly from the wild and placed in a protected bird area. they are given as much food as they need and have plenty of space. why would natural selection not occur in this population? a. there is no reason for genetic mutation to occur. b. the birds compete for limited resources, c. the population has not reached carrying capacity. d. there is no genetic variation in the finches.

Amines amides and amino acids are categories of

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?