Which fetal development occurs during the second trimester? Bones begin to harden. The roof of the mouth forms. The eyes can sense changes in light. The heart and circulatory system begin to develop.​

The correct answer is - The roof of the mouth forms.

Explanation:

In humans, 9 months of pregnancy can be divided into three trimesters which means approximately 12 weeks per trimester. Each trimester has specific fetal development.

The second trimester that starts after 12 weeks to 24 or 25th week of pregnancy and known for forming the joint bones, opening the eyes, movements of the fetus, and development of the palate or cleft which means the roof of the mouth develop in this time period of pregnancy.

this one is confusing

explanation:

idk

these are common warning signs of overtraining syndrome:

washed-out feeling, tired, drained, lack of energy

mild leg soreness, general aches, and pains

pain in muscles and joints

sudden drop in performance

insomnia

headaches

decreased immunity (increased number of colds, and sore throats)

decrease in training capacity/intensity

moodiness and irritability

depression

loss of enthusiasm for the sport

decreased appetite

increased incidence of injuries.

a compulsive need to exercise