Amature pine tree can have a biomass of several tons yet begins its life as a tiny seed, with a biomass of not more than a gram. what contributes to the huge increase in the pine tree's biomass?

D. carbon dioxide

Explanation:

An increase of a plant's biomass is the result of photosynthesis. Therefore, carbon dioxide and water ultimately contribute to the huge increase in the pine tree's biomass.

(From USATestprep)

President Kennedy did not like the spread of communism in Vietnam,

Explanation: When President Kennedy and the whole White House heard bout this news, they took action. They declared war on North Vietnam, by sending troops to Vietnam soil, sending money and weapons to fight Vietnam, Kennedy did not want the world to follow the steps of Communism, so that is why he acted so instantly and furiously against Vietnam!