Which of these statements is true about adaptive evolution?

adaptive evolution is a permanent change in a trait.
adaptive evolution is a temporary change in a trait.
adaptive evolution is a fluctuating change in a trait.

The correct answer is- Adaptive evolution is a permanent change in a trait.

Adaptive evolution can be described as increase in the frequency of alleles that are beneficial to the survival of an organism whereas decrease in the allele frequency that do not give any importance to the survival and reproduction of organism. It results because of natural selection.

Therefore, it depicts a permanent change in a trait as natural selection acts on the heritable traits of an individual.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.