________ is the study of the interrelationship between organisms, other organisms and their environment.

• Astrobiology

• Biology

• Ecology

________ is a field of science searching for life originating outside our living planet.

• Astrabiology

• Astrobiology

• Astronomy

Earth is unique in the Solar System because it is the only planet that __________.

• rotates on its axis

• has water

• can sustain life

The biosphere includes all parts of the earth and its atmosphere where life exists.

• True

• False

Biodiversity refers to __________.

• the total number of organisms in an area

• the amount of habitat available in an area

• the number of species in an area

Which of the following can be considered as biotic factor of an ecosystem?

• average temperature

• total rainfall

• the decomposers in the soil

All the organisms of the same species and living in the same area are known as a/an ___________________.

• community

• population

• individual or organism

The smaller part of an ecosystem where an organism lives is known as that organism's ___________.

• biosphere

• niche

• habitat

In the Great Barrier Reef, organisms living there are affected by __________ like water temperature, light, ocean floor and water pressure.

• biotic factors

• abiotic factors

These are regions or large areas of the biosphere that share certain conditions like climate and have certain organisms suited to live in it.