Have we always had the same amount of greenhouse gases in the Earth’s atmosphere?

tissue

explanation:

it is actually formed by geoup of cells which is tissue

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

helicase, i think thats it

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products