A = enzyme
B = active site
C = product
D = substrate
Answer:
Competition
Explanation:
Predation refers to one animal killing & eating the other animal. Eg, as referred - tiger & deer (former eats latter)
Competition is when an organism competes with another for resources. Eg, as given - paddy & weeds (they compete for growth resources - like nutrients etc).
Your best bet is most likely going to be B
A Chromosome holds part or all of the genetic material of an organism. It also includes packaging proteins which, aided by chaperone proteins, bind to and condense the DNA molecule to prevent it from becoming an unmanageable tangle.
So yes your best bet is B.
2
I believe the answer is two, since it's H2O.
Hope this helps!