| adaptation |
a particular change in the body of a living thing that helps the animal or plant to survive under new conditions. An adaptation happens over a very long time. [2/4 definitions] |
| alien |
a living being from another planet; extraterrestrial. There is no evidence that aliens exist, but many people believe there is life on other planets. [1/5 definitions] |
| alive |
having life; living. [1/3 definitions] |
| amoeba |
a tiny living thing made of only one cell. Amoebas move by changing their shape. They eat by wrapping their bodies around their food. Amoebas live in fresh and salt water, soil, and in animals. Most kinds of amoebas can only be seen through a microscope. |
| anatomy |
the parts of a living thing and how they fit together. [1/2 definitions] |
| animal |
one of a large group of living things that can move around by themselves to find food. Animals eat plants, funguses, or other animals. Birds, reptiles, fish, amphibians, mammals, insects, snails, and worms are some of the major kinds of animals. [1/2 definitions] |
| animate |
alive; living. [1/6 definitions] |
| Apache |
a member of a North American Indian people living mostly in the southwestern United States and northern Mexico. |
| apartment |
a room or set of rooms used as living space. |
| aquatic |
living or growing in or on water. [1/2 definitions] |
| bacteria |
microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. Bacteria are each made up of only one cell, but different kinds of bacteria can take different shapes. These organisms live in all parts of the earth including oceans, deserts, glaciers, hot springs, and in the bodies of most living things. While some kinds of bacteria are dangerous, most kinds are useful because they help in the digestion of food, in the making of soil, in the creation of medicines, and in many other natural processes. |
| bacterium |
singular form of "bacteria." Bacteria are tiny living things made up of one cell each. Bacteria live in most living things and in all parts of the earth. Most bacteria are useful to people, but some are harmful because they can cause disease. |
| being |
the state or fact of living or existing. [2 definitions] |
| biodegradable |
able to be broken down by the action of living organisms such as bacteria. |
| biodiversity |
the condition of having a wide variety of living things. If an area on the earth has biodiversity, it means that there are many different kinds of animals and plants living there. |
| biological |
having to do with living things and their life processes. [1/2 definitions] |
| biologist |
a scientist who specializes in biology. Biology is the study of living things, such as plants, animals, cells, and bacteria. |
| biology |
the science that studies the growth and life processes of living things. |
| biomass |
the total amount of living things in a particular environment, measured by mass per unit of area or volume. |
| bloodstream |
the blood flowing in a living thing. |
| box2 |
to fight as a sport or as a way of earning a living. [1/3 definitions] |