Answer:
A circle measures 360°.
A semicircle measures 180°.
Half of 180° is 90°.
A right angle measures 90°
A helpful trait (as an example, camouflage), would give it an advantage over organisms that don't. Ones without camouflage would most likely get eaten because it stands out, while the one who has camouflage would live long enough to breed. Overall, it boils down to living longer. I hope this helped!
Step-by-step explanation: