Number 1 is:

Number 2 is:

All the living and nonliving things in an area and their interactions.

Trees, plants, animals, microorganisms are examples of:

Soil, wind, water, temperature are examples of:

These are the roles in a food chain:

A community is made of several populations.

Any substance that damages the environment:

This diagram shows a:

In this food chain, which item is a producer?

In this food chain, which animal is always a predator and never a prey?

These scientists study weather:

Circulation helps redistribute heat on Earth.

In a hot-air-balloon, the air needs to be _________, so it can elevate.