The Sun provides the Earth with

• light only

• warm only

• light and warm.

• light and sound

On extreme hot climate, the water of a lake

• increases due to evaporation.

• decreases due to evaporation.

• changes into ice.

• has a lower temperature.

All the following factors pollute the water, except

• sunlight.

• animals wastes.

• human wastes

• plastic garbage.

All the following are affected by water pollution, except

• the soil

• the Sun.

• the animals.

• the plants

If the amount of grasses increases in an ecosystem, this directly increases the number of.....

• caracals.

• hawks.

• rabbits.

• lions.

When the number of........the amount of grasses in an ecosystem increase

• producers decreases

• decomposers decreases

• primary consumers increases

• secondary consumers increases

Overfishing and throwing plastic garbage in the sea affect the survival of........ directly.

• desert organisms

• marine organisms

• rainforest organisms

• redents

If there is a tertiary consumer in a food chain, this means that there is

• a primary consumer only.

• a secondary consumer only.

• a primary and a secondary consumers.

• neither primary nor secondary consumers.

The secondary consumer is considered as

• a prey for primary and tertiary consumers.

• a predator for primary and tertiary consumers.

• a prey for primary consumer.

• a prey for tertiary consumer.

Leakage of oil into seawater negatively affects the

• desert organisms

• marine organisms

• forest organisms

• rivers organisms