Physics, 30.08.2019 20:40 obryonshaniya10
According to scientific evidence, earth’s earliest atmosphere lacked oxygen. over time, oxygen was added to the atmosphere.
which statements explain how this change occurred and how it affected life on earth?
choose all answers that are correct.
a.
oxygen is needed to carry out photosynthesis. when cyanobacteria evolved, they began to carry out photosynthesis.
b.
adding oxygen to earth's atmosphere allowed for the development of prokaryotic organisms, which need oxygen to carry out many of their life processes.
c.
adding oxygen to earth's atmosphere allowed for the development of eukaryotic organisms, which need oxygen to carry out many of their life processes.
d.
oxygen is a product of photosynthesis. when cyanobacteria evolved, they began to carry out photosynthesis.
Answers: 1
Physics, 21.06.2019 23:30
The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of
Answers: 1
Physics, 22.06.2019 00:30
Ablock of steel has a density of 0.29lbs per cubic inch. if the block has dimensions of 1 inch by 1 inch by 3 inches, what is its weight? a. 0.29lbs b. 0.58lbs c. 0.87lbs d. 1lbs
Answers: 1
Physics, 22.06.2019 02:50
20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.
Answers: 3
Physics, 22.06.2019 07:30
Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories
Answers: 3
According to scientific evidence, earth’s earliest atmosphere lacked oxygen. over time, oxygen was a...
Mathematics, 09.07.2021 01:00
Mathematics, 09.07.2021 01:00
Mathematics, 09.07.2021 01:00
English, 09.07.2021 01:00
Mathematics, 09.07.2021 01:00
Mathematics, 09.07.2021 01:00
Mathematics, 09.07.2021 01:00
Mathematics, 09.07.2021 01:00