1)radiation is a
a.
form of plastic.
c.
byproduct of factory smoke.
b.
byproduct of atomic energy.
d.
form of acid rain.

2)who was yury gagarian?
a.
he created the steam engine.
c.
he was the first environmentalist to write a national book.
b.
he created the chunnel.
d.
he was the first man in space.

3)jets, high speed trains, highways and the increase of automobile ownership means that people travel more
a.
easily
c.
cautiously
b.
quickly
d.
a and b

1. Option b, byproduct of atomic energy

2. Option D, He was the first man in space

3. Option D, both a and b

Explanation:

1. Whenever nuclear fission or fusion reaction occur, radiation energy is released in some or the other form.  

For example -  

Uranium-235 or Plutonium-239 undergo nuclear fission reaction where their nucleus splits into lighter nuclei along with release of free neutrons, gamma radiations and kinetic energy

2. Yuri Gagrin was the first man in the world to go on any space expedition. On 12 April 1961, his space capsule completed one round around the earth.  

3. With the increase in vehicle ownership, it is clear that travelling is an essential part of day to day life of people. They travel through high speed vehicles on improved infrastructure because they are cautious about their comfort, ease and travel time.  

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

c

explanation: