Biological soil crusts<span> are communities of living organisms on the </span>soil<span> surface in arid and semi-arid ecosystems. They are found throughout the world with varying species composition and cover depending on topography, </span>soil<span> characteristics, climate, plant community, microhabitats, and disturbance regimes.</span>
Answer:
Caroline Herschel
Explanation:
She was the first women to discover a comet and calculate its path.
C.) T<span>he DNA unravels to make two strands </span>