Which is an example of how bacteria help keep the environment clean?
They can reduce oxygen in the air.
They can decompose waste.
They can help develop medicines.
They can slow digestion.

Hedgerows have created a new ecosystem within britain’s a. farms b. cities c. forests d. industrial areas

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a.earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c.earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.

Tom wants to conduct a scientific study but he needs to finish by the end of the school year. what practical way could tom work around this limitation and be successful in his study?