Tube through which food is propelled but no digestion takes place

What is the difference between a sound intensity, volume pitch and frequency

The things that living organisms need to stay alive are

Most of the ocean environment consists of very deep water beyond the shallow coastal region. This open ocean environment is sometimes referred to, simply, as

An excessive metabolic rate is caused by

The same, unknown bacteria is isolated from 20 sick individuals. Their samples were grown in culture and then placed in 10 healthy mice. Those mice started to show signs of a heightened immune response.

A scientist claims plants can communicate with each other in a variety of ways. justify the claim of the scientist and describe the types of responses that result from the communication of two different plants.

Which of these scenarios illustrates natural selection due to behavior

What is a device that converts energy of motion into electrical energy

Which type of connective tissue makes up the greatest proportion of the skeleton of a human embryo?

Which substance is not absorbed by the body when using snuff?