In the lock-and-key model of enzyme action, the fits into the of the enzyme.
a) product; substrate.
b) active site; product.
c) substrate; active site.
d) active site; substrate.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this