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3 years ago

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:

Explanation:

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Answer:

True

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4 years ago

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Organisms that are most likely to use evaporative cooling would be ____________.

TEA [102]

Answer:

Organisms That Are Most Likely To Use Evaporative Cooling Would Be Large Terrestrial Organisms Living In A Hot And Dry Climate Small Flying Organisms Living In A Hot And Dry Climate Large Terrestrial Organisms Living In A Warm And Wet Climate Small Flying Organisms Living In A Warm And Wet Climate.

Explanation:

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3 years ago

HELP ME. What are ways that ordinary people can help to keep antibiotic resistance from getting worse? Express your opinion abou

ycow [4]

By taking daily antibiotics, people are encouraging resistance by getting their immune systems used to the formulas. Antibiotic resistance<span> occurs when bacteria change in a way that reduces the effectiveness of drugs, chemicals, or other agents designed to cure or prevent infections. The bacteria survive and continue to multiply, causing more harm. I think that people can help by not taking antibiotics for every little pain they have, instead try other simple remedies and only use medicines in cases where other remedies won't help. </span>

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3 years ago

An inhibitory stimulus has occurred. B. Chemically gated potassium channels have opened. C. Excessive potassium has diffused out

andrezito [222]

Given question is incomplete. Complete question has been attached.

Answer:

C. Excessive potassium has diffused out causing hyperpolarization.

Explanation:

The nerve action potential can be divided into following stages:

Stimulus is detected by the cell in resting stage.
Sodium channels in the membrane open from where influx of sodium ions occur which is called depolarization
After a while, sodium channels close and potassium channels open from where efflux of potassium ions occur which is called repolarization.
The membrane potential further lowers due to continous efflux of potassium ions which is called hyperpolarization.
After a while potassium channels close and membrane returns to its resting stage.

In the given figure, stage 4 depicts hyperpolarization because the membrane potential has dropped to the lowest point below -70mV. Hence, option C is correct.

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4 years ago