Question

Which of the following describes an example of an energy resource that does not pollute the air with greenhouse gases?
Answer
Biomass energy which is generated by burning wood or garbage
Hydropower which transforms the energy of flowing water into useable electricity
Natural gas which is found trapped in sedimentary rock deposits
Nuclear power which is generated by nuclear fission or fusion

Answer 1

I'm not sure, but I think its hydropower because all three release carbon dioxide. I repeat, I'm not sure, you might want to confirm with someone else.

Answer 2

B

Answer 3

what about this one?

Why is bacteria an essential part of the nitrogen cycle?
Answer
Bacteria are responsible for fixing nitrogen into usable forms for other organisms.
Bacteria, through assimilation, absorb nitrates or ammonium ions from the soil.
Bacteria use the nitrogen which prevents harm to other organisms.
Bacteria use the nitrogen that has been fixed by plants to create atmospheric nitrogen.

Answer 4

c

Answer 5

i'm pretty sure

Answer 6

Why do scientists believe that life first emerged from the ocean and onto land well after the ancestors of modern-day cyanobacteria populated the Earth?
Answer
The ancient cyanobacteria converted the Sun's radiant energy to heat, warming the ocean waters. They eventually drove many organisms from the oceans and onto land.
The cyanobacteria produced radiant energy from the nitrogen and carbon it absorbed from the shallow sea floor. Organisms needed this light energy to see on land.
These bacteria provided a much needed chemical energy source for organisms living at the shoreline. Without this food source, the first land-dwelling organisms would not have survived.
These bacteria used visible light energy to create chemical energy, expelling oxygen that was converted to ozone. The ozone blocked the Sun's harmful UV radiation from reaching the ground.

Answer 7

Please ask as separate question so that AngelPSP can get the medal he deserves.

Answer 8

i have him the medal

Answer 9

gave8

Answer 10

*

Answer 11

@AngelPSP please explain the answer.

Answer 12

because when bacteria convert ammonia into nitrates and nitrites, producers need them to make proteins, and then consumers eat the producers and reuse the nitrogen to make their own proteins.

Answer 13

do you know this one ?

Why do scientists believe that life first emerged from the ocean and onto land well after the ancestors of modern-day cyanobacteria populated the Earth?
Answer
The ancient cyanobacteria converted the Sun's radiant energy to heat, warming the ocean waters. They eventually drove many organisms from the oceans and onto land.
The cyanobacteria produced radiant energy from the nitrogen and carbon it absorbed from the shallow sea floor. Organisms needed this light energy to see on land.
These bacteria provided a much needed chemical energy source for organisms living at the shoreline. Without this food source, the first land-dwelling organisms would not have survived.
These bacteria used visible light energy to create chemical energy, expelling oxygen that was converted to ozone. The ozone blocked the Sun's harmful UV radiation from reaching the ground.

Answer 14

i'm going with b

Answer 15

and this one?
When an organic compost pile is built correctly (sufficiently large, slightly moist, and containing a variety of organic material), it tends to get hot. Which of the following best explains why a compost pile gets hot?
Answer
Energy-containing organic molecules within the compost pile spontaneously break down and release their energy as heat.
Solar energy hitting the pile causes photosynthetic microorganisms in the pile to begin working and releasing the stored energy as heat.
The decomposers are breaking down energy-containing organic molecules for their own use and some of the energy escapes as heat.
The decomposers are constantly moving around within the compost pile and the friction of their motion heats up the pile.

Answer 16

idk

Answer 17

wah:(

Answer 18

i don;t know

Answer 19

okay well thanks for the ones you answered ! (: