| A | B |
|---|
| ecology | study of relationships between organisms and their environment |
| organism | any form of life |
| species | groups of organisms that resemble each other |
| wild species | lives in a natural habitat |
| domesticated species | lives in an environment created by humans, such as a zoo or farm |
| population | group of interacting individuals |
| genetic diversity | variations in individuals genetic make-up |
| habitat | place where a population normally lives |
| community | where populations of many different species live |
| ecosystem | community of different species interacting with one another and nonliving environment |
| ecosphere/biosphere | all of the earth's ecosystems together |
| cell | basic unit of life |
| reproduction | production of offspring by one or more parents |
| asexual reproduction | reproduction by simple cell division |
| sexual reproduction | reproduction that occurs from the combination of gametes |
| core | earths inner layer made of mainly iron |
| crust | outermost and thinnest layer |
| mantle | largest zone of earth's interior |
| lithosphere | earth's crust and upper mantle |
| atmosphere | envelope of air around planet |
| troposphere | part of atmosphere directly above earth, where weather occurs |
| stratosphere | part of atmosphere containing ozone, above the troposphere |
| hydrosphere | earth's liquid and water |
| closed system | energy is exchanged between system and environment |
| open system | matter and energy are exchanged between system and environment |
| nutrient | any atom, ion or molecule an organism needs to live, grow or reproduce |
| macronutrients | nutrients needed in large amounts such as oxygen |
| micronutrients | nutrients needed in small amounts |
| nutrient cycle/biochemical cycle | nutrients, atoms, molecules that are continously cycled from the nonliving part of the environment to the living part of the environment |
