[BWS.04] Second is the SI base unit for measuring
O time
O length
O volume
O mass

Time

Explanation:

i think the answer is a.keratin is the pigment responsible for skin color.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.