Question

question 10 (5 points) during the carboniferous period, plants and animals grew very large due to high concentration of a) argon in the ocean. b) oxygen in the atmosphere. c) nitrogen in the atmosphere. d) carbon dioxide in the oceans.

Explanation:

During the Carboniferous period, high - oxygen levels in the atmosphere allowed for more efficient respiration, enabling plants and animals to grow larger. Argon is a noble gas and not a factor in growth. Nitrogen is mainly used in processes like nitrogen - fixation and not directly related to large growth. Carbon dioxide in the oceans is more related to the carbon cycle and not the cause of large - scale growth during this period.

Answer:

B. oxygen in the atmosphere.