Which of the following is an example of an adaptation?

A) Some birds use tools in order to help them reach their prey bidding tree trunks.
B) An organism inherited an allele for hemoglobin that makes it immune to malaria.
C) Giraffes want to reach the leaves on tall trees, so they develop longer neck.

The special characteristics that enable plants and animals to be successful in a particular environment are called adaptations. Camouflage, as in a toad's ability to blend in with its surroundings, is a common example of an adaptation. ... Adaptations afford the organism a better chance to survive in its surroundings.

Explanation:

the real answer is b. scintillation counter

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.