Enzymes increase the activation energy (the energy needed to start a reaction) and speed up chemical reactions in organisms.

The distribution of related animals and plants across the world

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

The relationship between intron and exon