the pathway coming to the lungs are veins and the ones going away from the lungs are the arteries :)
The answer is B. The higher the concentration of substrate, the FASTER a reaction happens (since there are more opportunities for molecules to collide in a way that favours the reaction), so B is an incorrect statement.
The other three options describe correct features of catalysts and/or enzymes (which are considered “biological catalysts”).
I'm not sure but I think it's B
Covalent bond is when two atoms share one or more pairs of electrons, an example of this could be H20 or C02.
ionic bonds are when one or more electrons from am atom are removed and attached to another, which can result in positive or negative ions which attract each other, an example of this could be table salt.
D is the answer because carbondioxide and oxygen are both needed for plants or green plants to survive.
I hope it helped
