Question

why were hydrothermal vents important for early life development? a) they provided sunlight for photosynthesis b) they had moderate temperatures c) they provided chemical - energy sources and protected environments d) they contained high levels of oxygen

why was oxygen initially harmful to most early life forms? a) it caused it to freeze b) it blocked sunlight c) it was chemically reactive and toxic to organisms adapted to oxygen - free conditions d) it prevented chemical reactions from occurring

Explanation:

For the first question, hydrothermal vents provided chemical energy sources and protected environments which were crucial for early - life development. For the second question, oxygen was initially harmful to most early - life forms because they were anaerobic and oxygen was a reactive and toxic substance to them.

Answer:

1. c) They provided chemical energy sources and protected environments
2. c) It was chemically reactive and toxic to organisms adapted to anoxic conditions