What term best describes the following organisms: some with tetramembraneous chloroplasts, some with hairy flagellae, some with pseudopods; some with cuplike indentations in the cell membrane?
a) excavata.
b) sar.
c) plantae.
d) unikonta.

Which statement is true regarding weathering in dry environments? a) chemical weathering is absent because of a lack of humidity. b) physical weathering is usually more evident than chemical weathering. c) it is impossible to identify the type of weathering that has occurred. d) physical weathering does not play a significant role in dry environments.