Afertilized egg (embryo) attaches itself to the lining of the where the fetus develops.

Vertebrates have this type of circulatory system: wut i it owo

What effect do stimulants, such as cocaine, have on the nervous system? o a. stimulants change the activity of neurotransmitters. o b. stimulants mimic hormones and influence moods. o o c. stimulant|mchange how sensory information is processed. d. stimulants decrease brain activity.

When studying heredity, what is the relationship of dna based and traits? super urgent !