The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old.
The answer is B.
It describes the relationship between photosynthesis and respiration accurately.
A contour interval is the lines on a topographic map that state the height (from sea level) of the hill, valley, mountain or the ground level.
Its ethier loose soil or dense vegetation but i have a feeling its loose soil.
Execration in man
transport and gutation in plant
