Of the following choices, which would require the cell to expend energy to move it across the membrane?
water
oxygen
carbon dioxide
protein

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Greenthe fossil record is the history of life recorded byhuman observationgod.climatologists.remains of the past.

When a doggo starts to pace around in the same line for a hand full of days. what would that mean?