Semester 2 Review

protection of natural habitat

increased use of pesticides

increased hunting

Plants' root systems absorb many toxins from the soil which might contaminate the water supply.

Plants remove significant amounts of carbon dioxide gas from the atmosphere through the process of photosynthesis.

Plants' root systems hold the soil in place, and when they are gone, there is increased pollution from runoff.

Contour plowing by farmers increases the level of rainwater run-off.

Burning coal and oil increases the level of carbon dioxide in the atmosphere.

Copper wire in power transformers increases the speed of the electrical currents.

Biodegradable plastics are stronger and more durable than non-biodegradable plastics.

The use of biodegradable plastics increases the production and use of plastic materials.

The use of biodegradable plastics helps in the reduction of pollution caused by regular plastics.

increase in the size of fish in the river

increase in the water flow in the river

decrease in the population of aquatic organisms in the river

changes in living space

availability of prey

presence of predators

Positive: crow. Negative: cuckoo​.

Negative: crow. Positive: cuckoo​

Positive: crow.​ Positive: cuckoo.

All primary consumers have parasitic relationships among one another.​

All primary consumers form mutualistic relationships among one another.

All primary consumers have competitive relationships among one another.​

No; the sand is made up of small rock fragments

No; 94% of the cactus is water.

Yes; the cactus and sand don't move