I believe it is D. More African elephants today naturally lack tusks compared to the elephant populations 100 years ago, because big game hunters sought elephants for ivory.
The kidneys is controlled by hormones and by the composition of the urine since the hormone released is called ADH which is produced by the pituitary gland.
Answer:
It has 4 trophic levels.
Explanation:
The first level would be the producers, followed by the primary consumers, then the secondary consumers, then the tertiary comsumers.
/ Tertiary consumers \
/ Secondary Consumers \
/ Primary Consumers \
/ Producers \
/________________________________\
The correct answer is 20% on average. The ideal percentage rate of a healthy man with normal weight is 18 to 22%. However, a range of 7-13% is considered normal for male professional athletes, because their muscular mass is much greater. The physiological minimum rate which is acceptable for males is 4-6%.
