A model organism is a species that researchers study to better understand certain biological processes. Mollusks and arthropods
are commonly used as model organisms for studying mechanisms of learning and memory, while sponges and jellyfish are not. Why is this? A.
Mollusks and arthropods can detect stimuli from their environment, while jellyfish and sponges cannot.
B.
Mollusks and arthropods exhibit cephalization, while jellyfish and sponges do not.
C.
Mollusks and arthropods exhibit segmentation, while jellyfish and sponges do not.
D.
Mollusks and arthropods can respond to changes in their environment, while jellyfish and sponges cannot.
The model organisms is a species that researchers use to understand certain biological features. These species are arthropods and Mollusks tend to respond to environment better as compared to the jellyfish and sponges.
Jelly fish and sponges lack nervous system and they do not respond to the stimuli generated by the environment.
When the diaphragm contracts (it's a large flat muscle), it pulls the lungs down this causing expansion which eventually lead to inhalation of air. If it's injured, then that will be affected.
