Answer:
C) Oxygen
Explanation:
As the Earth cooled, a primitive atmosphere was created by the out-gassing of early volcanoes. The early atmosphere contained no oxygen and would have been toxic to human beings, as well as most other life on Earth today.
Hope it helps!
Answer:
Explanation:
The test tube that first stops in bubbling or the production of a gas is the tube that contains the catalyst since the reaction ended faster than the others. A catalyst is known to speed up a reaction so it must the situation aforementioned is the answer.
The snakes nutrition is carnivores based. The frogs nutrition is also carnivores based (feeds on other animals), but in this situation the snake is the predator and the frog is the prey