Which factor causes gas and dust to pull together during the first stage of star formation?

density
gravity (i chose this)
heat
pressure

well it would be density. to pull together objects that will be gravity your welcome

Gravity

Explanation:

This is the answer because it pulls together everything to make a star

answer: after carbon dioxide enters the leaf through stomata it moves into the mesophyll cells where photosynthesis occurs and glucose is constructed. respiration occurs when glucose (sugar produced during photosynthesis) combines with oxygen to produce useable cellular energy.

explanation:

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.