Choosing which plants or animals to grow or reproduce is called...

A crop grown by choosing parents of different varieties is called...

Parts of living cells that cause a particular trait to be passed on are called...

Not having enough of something that is needed is called a...

Materials in foods that help people live and grow are called...

Chemicals used to kill harmful insects are called...

Materials added to soil to make it better for growing plants are called...

Something without any living germs or bacteria is...

A substance found in all living things; this is a necessary part of the human diet.

A form of energy that includes radio waves, microwaves, x-rays and visible light.

A steady force upon a surface is called...