A substance that enters Earth's cycles and does harm to living things is

A. a pollutant.

B. freshwater.

C. hydrogen.

D. oxygen.

Of all the debris that washes into the ocean, plastic remains the longest because it does not: A. float in currents B. biodegrade C. get ingested by fish D. get ingested by birds

Which is type of disease is a pathogen causes infectious or noninfectious

How does the concentration of salt in water affect the rate of osmosis?

A plants response to light is known as A. phototropism. B. gravitropism. C. thigmatropism. D. heliotropism.

Match each description with the correct division of the peripheral nervous system. somatic nervous system regulates voluntary activities parasympathetic nervous system regulates involuntary activities sympathetic nervous system called the rest and

What non examples of nucleotide

How does the warming of oceans impact ecosystems

4. which of the following describes the use of renewable energy? A) using natural gas to heat a house B) using a windmill to grind grain C) using petroleum to run a car D) using coal

What function do chloroplasts perform? A) They use light energy to make food for the plant. B) They control the activities in the cell. C) They produce proteins for the cell. D) They provide temporary storage for the plant's water.

Why is the study of human geography important?