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Which statement best describes a galaxy?

saw5 [17]

Answer: G

Explanation: A galaxy is indeed a collection of stars, gas, and dust held together by gravity.

6 0

3 years ago

The oxygen level of a lake suddenly starts decreasing. A biologist believes that photosynthetic organisms in the community have

Semmy [17]

Answer:

Scientists with different educational backgrounds can come to different interpretations of the same data.

Choice A is correct

Explanation:

A biologist is a scientist with specialized knowledge in the field of biology while a geologist is a scientist who studies the matter that make up the Earth as well as the processes that shape them.

Both scientists came to different interpretations of the same data since they have different educational backgrounds.

7 0

3 years ago

Why does the efficiency of a complex machine decreases as more simple machines are used ?

bearhunter [10]

By the law of conservation of energy, the energy input to a system must equal the output. However, when there are more moving parts in a machine, like in a complex machine, the energy converted to non-useful energy, such as the production of heat energy via friction, is increased. Therefore, the more the moving parts, the greater the losses of energy due to increased friction. This is why complex machines are less efficient.

3 0

3 years ago

DDT was widely used as a pesticide for 20 years. Its use was banned after studies showed severe side effects were evident in hum

e-lub [12.9K]

Answer:

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Explanation:

5 0

2 years ago

Which correctly lists three scientists who supported the heliocentric model of the solar system? Aristotle, Ptolemy, Copernicus

Vadim26 [7]

Answer:

Kepler, Galileo, Copernicus

Explanation:

6 0

3 years ago

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