It was proposed by a scientist named Charles Darwin.
Reptile scales! Or, more specifically, reptiles descended from dinosaurs.
The train traveled 100km (50x2) down and then 375km (75x5) up. So the train is 275km (375-100) up from where it started.
Answer:
Explanation: Human approach, attitudes and adherence to the safety skills does deal with the impact over environmental factors at a personal level. We have to be more careful and cautious while we pursue our own habits, and activities, with the aim of posing less harm to the environment in any way.
I think the answer is b. wavelength (:
