Which characteristics are common to birds and lemurs?
a. hair, biped
b. vertebrae, hair
c. tetrapod, vertebrae, biped
d. amniotic egg, tetrapod, vertebrae

i was thinking 4.0 v hope this

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.