The crossed extension reflex is the contraction of the extensors on one side of the body when the flexors are contracted on the other side.

ANSWER – TRUE

The crossed extension reflex is a withdrawal reflex. The main idea here is that when the flexor muscles on one side of the body are contracted, there is the occurrence of a reflex contraction of the extensors on the other side.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

answer; polycythemia is the correct answer;