That would be C.
Invasive species are brought to a new area by human activities.
Answer:
The shape of the enzyme determines which chemical reaction it will speed up.May strain the bonds of the substrate or put chemical groups of the active site in the correct position to speed up the reaction.
Answer:
Yes, if the touch their snot and touch you or an object you touch. They can also sneeze their existing snot at you if they didn't wipe it.
Because an antibody is "made" relative to the antigen, but kept at low levels when you are exposed the first time ("primary immune response"). The second time you're exposed to the same antigen, memory cells recognize it and the body produces a high level of antibodies, and the level of antibodies usually remains higher for a longer time ("secondary immune response"). This is your basic immune response (primary and secondary).
This explains exactly why vaccines are effective to extremely effective.
A eukaryotic cell can replicate itself two ways. Hope this helps!