A person going to bed because she feels sleepy is an example of a(n)
_response to an stimulus.
O A) voluntary; internal
OB) voluntary, external
OC) involuntary; internal
OD) involuntary, external

Which organ controls breathing? lungs alveoli heart diaphragm

Match the correct terms to their descriptions a system in which only energy but not matter is exchanged frozen water in snow part of geosphere that includes only soil a thin layer between the troposphere and the stratosphere cryosphere tropopause closed system pedosphere

Which strand is synthesized towards the replication fork