What are some good biotechnology topics?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Suppose that f : rn → rm and that a ∈ k, where k is a connected subset of rn . suppose further that for each x ∈ k there exists a δx > 0 such that f(x) = f(y) for all y ∈ bδx (x). prove that f is constant on k; that is, f(x) = f(a) for all x ∈ k

Atoms in a molecule are bonded together by sharing gaining or losing_