the three general classifications are sensory neurons, motor neurons and interneurons. I don't know how they work together to produce a response to an environmental stimulus:( sorry
Dorm residents experience the following secondary effects of heavy drinking:
interrupted studies, babysitting a drunk room mate and unwanted sexual advances,
Secondary effects of heavy drinking refers to those behaviors that a person person exhibited as a result of heavy drinking and how those behaviors affect those around him.<span />
I believe the answer is (B)
<span>a complex series of feeding relationships with many organisms interacting and depending on each other </span>
Answer is Middle Paleozoic era.
Paleozoic era was in 542 Ma - 245 Ma and it has 6 periods as Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian.
360-280 Ma - forming of vascular plants with woody tissues, seeds and veins.
430 - 410 Ma - forming of jawed fishes and first amphibians.
420 Ma - forming of scorpions
360 Ma - forming of crustaceans.
