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2 years ago

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About 1.2 billion years ago, eukaryotic and multicelled organisms evolved because _____. oxygen became available from cyanobacte

ria banded iron formations developed meteorite impacts increased the atmosphere got thicker from volcanic outgassing

1 answer:

Anna71 [15]2 years ago

3 0

Oxygen became available from cyanobacteria

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Most land mammals have the ability to rest one hemisphere of their brains at a time. Please select the best answer from the choi

raketka [301]

The answer is false, I just took the quiz

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2 years ago

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You are enjoying your vacation on the coast and decided to go snorkeling. Your tidal volume is 460 mL and breathing rate is 14 b

m_a_m_a [10]

Answer:

Option C

Explanation:

Option

A. 6440 mL/min

B. 4340 mL

C. 3500 mL/min

D. 2940 mL/min

Solution

It is required to find the minute ventilation which is equal to the product of rate of breathing and the total amount of gas being inhaled or exhaled per breathe. Let this minute ventilation be denoted by " $V_f$ "

Thus,

$V_f = TD * B_r$

where TD is the tidal volume and Br is the rate of breathing

Substituting the given values we get

$V_f = 460 *14 \\V_f = 6440$

We will now reduce the air held in the conducting zone of respiratory system

Air held per breathe $= 210$

Total Air held

$= 210 * 14 \\= 2940$

Amount of fresh air one can breathe in and out every minute

$= 6440 - 2940 \\= 3500$

Hence, Option C is correct

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3 years ago

In the visual analogy of a cell as a factory, what two functions of the nucleus are represented? How are these functions illustr

ludmilkaskok [199]

The control center of the factory.

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3 years ago

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1. Describe the first step in the digestive process. Why is it important?

monitta

The breaking down of food in the mouth is the first step of the digestive process, It’s important because the food gets broken down into a form that can be absorbed and used.

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2 years ago

Part II: For each of the genotypes below, determine what phenotypes would

Troyanec [42]

Answer:

4. Brown

5. Brown

6. Blue

7. Long

8. Long

9. Short

Explanation:

Dominant alleles are always expressed when they are present. Recessive alleles are masked by dominant alleles.

Therefore, two copies of a recessive allele are required to show the recessive trait. Either one or two copies of a dominant allele produces the dominant trait.

Therefore, for dominant brown eyes, BB or Bb gives brown eyes, bb gives blue eyes.

For recessive long tails, tt gives short tails, TT and Tt gibe long tails

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2 years ago