7th grade Spring Final Exam Review

What organism forms the foundation of all food chains, webs and pyramids?

This biome is the driest; it only receives 50 cm of rainfall a year (about 10% of the rainfall in the rainforest).

Series of community changes which occur on an entirely new habitat.

Are mostly grass and the number of trees within these biomes vary depending on the amount of r

A small specialized habitat within a larger habitat.

This is the coldest of all the biomes and species diversity is limited as a result. Usually in high elevations

Always starts on previously existing soil

The observed process of change in the species structure of an ecological community over time.

An example of a microhabitat is a

A newly quarried rock face or sand dunes produces which of the type of succession?

Areas devastated by catastrophic events such as wildfires, etc create which type of succession?

Biodiversity maintains the health of the _________ and its people.

71% of the Earth is covered in water. 70% of that is Ocean water (Marine). 1 % is Fresh water.

Cover about 1/3 of the Earth’s land surface. They give off Oxygen which we need to survive.

What explains why the leaves are growing upwards once the pot falls over?

The type of succession always starts on rock

Biodiversity provides us with food and medicine and contributes to our

It is a measure of the variety of organisms present in different ecosystems.

There are ______ main types of succession

What explains why the roots are growing downward once the pot falls over?

Are regions of the world with similar climate (weather, temperature) animals and plants

The image below illustrates what?