The cell mass that develops from the fertilized egg implants itself in the uterine wall during the stage of prenatal development. a. fertilization b. fetal c. embryonic d. germinal

Which of the following is a difference between a food chain and a food web? selected: a. food webs contain both plants and animals. food chains only contain animals.this answer is incorrect. b. food webs show energy transfer. food chains show which animal eats which animal. c. food webs separate organisms by tropic level. food chains do not. d. food webs are a complex patterns of energy flow. food chains only show one line of energy flow.

Which heredity condition causes a buildup of mucus in lungs and pancreas? a. cystic fibrosis b. heart disease c. huntington's disease d. sickle cell anemia

What is used as a template during replication? a- mrna b- trna c- rrna d- dna