Muscles can only cause bones to move by contracting. this means that a muscle can only move a bone in one direction so muscles work in antagonistic pairs - one muscle contracts while the other relaxes.

Which of the following statements is true? A. Genes make up chromosomes. B. Genes make up cells. C. Chromosomes make up genes. D. Chromosomes make up proteins.

Briefly describe what is meant by a pioneer species.

Most enzyme fall into what group

Why would yellow perch dna be closer to walleye dna? why?

A researcher has collected a sample of feces from a woodland area and has extracted from it proteins that are produced in the gut of a rare tropical bird. the researcher wants to use these samples to compare them to other bird species.

What are simple sugars like glucose called?

The contraction of the diaphragm and the external intercostal muscles begins inspiration. List the other muscles involved in inspiration. Explain exactly what happens, in terms of volume and pressure changes in the lungs, when these muscles contract.

In order to survive all cells need to be able to?

Which description best matches an S wave

An educate guess about the meaning of the term "chlorophyll"