Answer:
Human being plays a key role to maintain ecological balance because they have the highest thinking capacity as compared to other living organisms. Sufficient food availability to all living organisms and their stability reflect the existence of ecological balance.
Explanation:
Sperm must be deposited and transported to the site of fertilization. Ovulation must occur and the egg must be "picked up" by the tube. Union between the sperm and egg must result. The embryo must implant and begin to grow in the uterus.
Guanine would be 43%
ALL 4 BASES MUST EQUAL 100
SO 7 THYMINE +7 ADENINE =14
100-14 T&A=86 OF GUANINE AND CYTOSINE
86 G&C ÷2= 43 OF GUANINE AND CYTOSINE