The answer is 2. 2 Hydrogen atoms to 1 Oxygen atom.
Answer:
It could be embreology. (I think i spelled that wrong)
Explanation:
It is a way to compare the embreos of two species to see the similarities between the two. If there are similarities then they have a common ancestor. If they don't have similarities then they arent from the same family.
The first answer is A and the second answer is B
A food chain describes how energy and nutrients move through an ecosystem.In the food chain, energy is transferred from one living organism through another in the form of food. There are primary producers, primary consumers, secondary consumers and decomposers- all part of the food chain.
I hope it'll help you...