Animals' internal body structures can either be coelomate, acoelomate, or pseudocoelomate. this means they may or may not have

a. a heart

b. a circulatory system

c. lungs

d. a body cavity

Natalie had random hand movements when she was two months old. when she was six months old, she used to grab a block with her whole hand. now at the age of ten months, she can grasp the same block with her thumb and forefinger. this sequence of growth in her hand and finger movements is according to the pattern.

Match the types of competition to their descriptions

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels