I would say B.
A, umm, don't crash trains, that's bad.
C, Lillian is wondering how fast a train can go, not at what curve will it fall.
D, Lillian isn't wondering about the size of the trains, just the speed.
Answer:
photochemical
hydrocarbon
Explanation:
Morning commuter traffic in cities contributes to<u> photochemical</u> smog. In this type of air pollution, a mixing of <u>hydrocarbons</u> from certain plants, nitrogen oxides from cars, and UV radiation from the sun results in a variety of pollutants, such as ground-level ozone, which can cause coughing and breathing problems.
<em>Photochemical smogs are caused by the photochemical reaction of hydrocarbon and nitrogen oxides in the lower atmosphere with sunlight playing a major role. The reaction of the hydrocarbon with the nitrogen oxide in the presence of light leads to the evolution of ozone gas while nitrogen oxide has the capacity to react with the sunlight on its own to produce nitrogen dioxide. This result in the formation of smog</em>
Answer:
The answer is B.
Explanation:
If warmer temperatures last longer there will be no need for the white fur
Answer:
It's d , activity level
Explanation:
Tempratement is something you are born with and it defines how an individual respond to the world
While activity level is the amount of motion that a child performs while doing some physical activity
They start in utero when the baby moves and kicks inside
When they grown up ,some children possess more energy and they don't seem to stay at one place
When they grow up they will jump and run a lot ,those who are highly active
Answer:
they were discovered by Robert Hooked in 1665. It looked like similar to cellua.
