Words

Question 1

Nocturnal

Answer 1

Active at night: usually for animals

Question 2

Conservation

Answer 2

preservation, protection, or restoration of the natural environment and of wildlife.
“nature conservation”

Question 3

Concentration

Answer 3

a close gathering of people or things.
“the island has the greatest concentration of seabirds in the north-west”
Similar:
gathering
the action of gathering together closely.
“the concentration of power in the hands of nobles”