Which structure in the leaf controls the opening and closing of the stoma?

a. cuticle

b. epidermis

c. guard cell

d. spongy mesophyll

The external opening to the reproductive system of a cow is the:

Study the diagram about the varying pressures of Earth's Layers. Earth apostrophe s layers. The Crust at depth of 0 kilometers, upper mantle depth 410 kilometers, lower mantle depth 2,900 kilometers at 125 gigapascals, 2,200 degrees Celsius.

Small foreshocks that precede a major earthquake can occur

Climate warming trends allow plant and insect species to inhabit larger ranges. true or false

The ability of a muscle to contract and relax is dependent on the flow of what substance in and out of the muscle cell?

What would happen if a keystone species is removed from an ecosystem

Which material will displace a volume of water? all of them cork and wax iron, lead, and aluminum none of them Which material will displace a volume of water less than its own volume?

Why is mitosis responible for for growth, repair, and maintence

Explain one way in which a hormone can prevent contraception

1) Which of the following explains why a bone in a bird's wing is homologous to a bone in a lizards leg? A) The bones in the two species provide for the same type of motion.