48. The body's physical structure is supported by what system? A. Cartilage system
B. Nervous system
C. Skeletal system
D. Ligaments system

Mention true or false : a) cholera is marked by acute diarrhea and no urination. b)mosquitoes are the source of dysentery germs.

Which direction does the energy flow in this energy pyramid ?

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.