In which trimester do the bony parts of the skeleton begin to form
a. first
b. second
c. third
d. none of the above

B. Second

Explanation:

In the second trimester the bony parts of the skeleton begin to form .

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.