Please help will give all my points

Kinases add - groups to other enzymes. this activities some enzyme while inhibiting other

Consider the activity and specificity of the three enzymes. pepsin is most active in the human and to digest

Why does competiton happen? a: different organisms have different needsb: there are limited resources in an ecosystemc: there are no predators in an ecosystemd: organisms do not need the same resources (i think it's b but i'm not sure)