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Elis [28]
3 years ago
8

Which animal adaptation happened before the others?

Biology
2 answers:
lara [203]3 years ago
7 0

Answer:

C. Bilateral symmetry

Explanation:

Just before the Cambrian explosion, approximately 600million years ago, multicellular aquatic animals are thought to have developed new body plans. As a result they split into two groups of organisms which were notably radially symmetrical and bilaterally symmetrical. These early bilaterally symmetrical animals were simple organisms without a body cavity called a coelom; further evolution, led to the development of complex coelomates. Eventually, land-dwellers capable of respiring out of water with the aid of lungs emerged, and subsequently, their adaptations allowed for reproduction in their new habitats.

BigorU [14]3 years ago
7 0

Answer:

c

Explanation:

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Fynjy0 [20]

We have two surfaces of nerve cell the outer and inner surface

- resting : when the outer layer ion charges more positively than the inner layer - depolarization : we have the counter part of this state

- repolarization : return to the polarization

- hyperpolarization : the inner negative ion charges will be more negative even more than the resting potential

Resting potential: the inside of the neuron's axon is -70mV versus the outside of the membrane 

Threshold potential: If the impulse that is received by this neuron's dendrtes meets or exceeds its threshold level enough Na+ activation gates (which are protein ion channels in the axon membrane) will open and Na+ will start to flow into the axon following a charge and concentration gradient.

Depolarization: If the action potential has been initiated (and Na+ has started to move into the axon) then the internal negative charged areas of the membrane will open their Na+ gates as well. 

Repolarization: Once K+ have started to move outside of the axon, the original charges along the axon membrane start to become reestablished 

Hope That Helps!

6 0
3 years ago
Community and housing development rules that govern such things as minimum lot size, the outside appearance and landscaping of t
BaLLatris [955]

Answer:

Zoning bylaw

Explanation:

Community and housing development rules that govern such things as minimum lot size, the outside appearance and landscaping of the property, allowable secondary buildings, parking of vehicles, and other aspects of the use and appearance of the property are called zoning by law

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D. The tendency of a cell to maintain a stable internal environment.

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