Which statement is in agreement with Darwin's theory of evolution? A) More offspring are produced than can possibly survive
B) The organisms that are the most fit are always those with the greatest strength
C) Mutations are always beneficial
D)Acquired characteristics are inherited

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

(nitrogen fixation) will be your answer sorry if im wrong