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quester [9]
3 years ago
15

The theory of __________ proposed that a series of catastrophes or mass extinctions followed by repopulation could explain why s

pecies change over time.
Biology
1 answer:
Roman55 [17]3 years ago
6 0
The theory of evolution proposed that a series of catastrophes or mass extinctions followed by repopulation could explain why species change over time
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For the voltage-gated sodium channel to allow sodium into the cell:_______.
Lostsunrise [7]

Answer:

The correct option is - (a) the activation and inactivation gates must both be open.

Explanation:

Option (a) is correct because of the following reason -

The axonal membrane is at its natural resting potential until an action potential occurs, and Na^+ channels are deactivated and blocked on the extracellular side by their activation gates. The activation gates open in response to an electric current, allowing positively charged Na^+ ions to flow into the neuron through the channels. When enough Na^+ has penetrated the neuron and the membrane potential has reached a certain level, the Na^+ channels inactivate themselves by closing their inactivation gates at the height of the action potential. The inactivation gate can be thought of as a "plug" tethered to the intracellular alpha subunit's domains III and IV. When the inactivation gate is closed, the flow of Na^+ through the channel is stopped. As a result, both the activation and inactivation gates must be open to enable sodium ions to enter the cell.

<u>Hence , the correct option is (a).</u>

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Tall height (T) is dominant over short height (t) in pea plants. A farmer breeds two pea plants together, producing 25% short an
Nesterboy [21]

Answer:

Tt and Tt

Explanation:

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2 years ago
When two ions come together with the same charge come together, thier electric fields will...
valentinak56 [21]
They will attract each other together
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. Which statement accurately describes the energy needs for photosynthesis and cellular respiration?
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What are the statements?
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The sea dog francis drake sailed along the coast of _______
PilotLPTM [1.2K]

Answer: West African Coast

Explanation:Hawkins sailed with his cousin (and soon-to-be Sea Dog) Francis Drake to the West African coast in order to capture slaves for trade in the Caribbean and South America, privateering along the way.

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