this substance makes up the majority of your cells, and is necessary for them to carry out most of their chemical reactions. what is it? a)carbon b)oxygen c)sugar d)water

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

What does it mean for a cell membrane to be selectively permable

What best describes the structure of the declaration of independence?