The __ and __ returns blood from the body to the __ of the heart

Natural selection only occurs with which type of variation? Environmental variation Genetic variation Artificial variation Neutral variation

What happens if u remove energy from gas

In many countries fishing is strictly regulated: method, limits, seasons, fishing grounds, and size are all legally defined. Such conservation methods came about for many reasons. Which of these is NOT one of those reasons?

Which process is a form of mechanical weathering? A. Hydration B. Carbonation C. Exfoliation D. Oxidation

The relationship between humans and their digestive bacteria can be describe as

How did earth cool down enough to sustain life

Describe the role of environment in obesity.

During mitotic cell division, daughter cells are produced that are genetically their parent cell. submit

Why are frogs said to have 2 lives

A rock with different fossils is shown below: Fossil Layers Fish Shell Fern Oak Based on the fossil, which organism evolved last?