A tree uses gas A to produce Gad B. An animal uses gas B to produce gas A What gas B in this cycle A. Oxygen B. Nitrogen C. Carbon Dioxide D. Carbon Monoxidd

Oxygen

Explanation:

Plants use carbon dioxide and produce oxygen through the process of photosynthesis. Animals (and plants) use oxygen and produce carbon dioxide through the process of cellular respiration.

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g1

choices:

a. g2. b. g1. c. m

cell division has two checkpoints namely, g1

checkpoint and spindle assembly checkpoint. the checkpoint which determines if

division has properly occurred is the g1 checkpoint. at this point, is a damage

in the dna is detected or  the has not reach the optimum size, the cell is

stopped in g1 and is not allowed to proceed to further process.

source:

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.