Vertebrates that are cold-blooded, have dry skin and scales and usually lay eggs are classified as
a. amphibians
b. birds
c. reptiles
d. mammals

The answer is B. Birds

Explanation:

I got it in usatestprep first i put c reptiles but i got it wrong and the answer was b

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.