What parts are in the skeletal system

Which of the following is true of photosynthesis? a)carbon dioxide is a reactant b)water is a product c)most reactions within this process are exothermic d)oxygen is a reactant

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal responds by in order to its core temperature?

When proteins are being produced by a cell, scientist say that the genes are question 2 options: activated turned off replicated deactivated