Which of the following structures provides support and movement ? A. Heart and skin.
B. Nerves and brain
C. Lungs and spine.
D. Bones and muscles

The rate at which molecules water and oxygen can enter a cell is determined by the-

The table below shows the number of foot bones in some horse fossils.horse fossil recordhorse fossil number of foot bonesp 19q 17r 24s 13ancient horses had more bones in their foot then present-day horses. the present-day horse has 11 foot bones. what is the correct order of evolution of the horse starting from the youngest fossil? a. q p r s b. s r p q c. s q p r d. r p q s

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they