Form classification is the classification of organisms based on their morphology, which does not necessarily reflect their biological relationships. Form classification, generally restricted to palaeontology, reflects uncertainty; the goal of science is to move "form taxa" to biological taxa whose affinity is known.
I don't know what the lotka thing is, but I'd guess c and d because their coefficients are closer
A biochemist studies the living beings, the chemical processes that go on in their bodies and the different ways in which they get energy from food.
