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VikaD [51]
3 years ago
13

Which of the following happened during the Precambrian Era?

Biology
1 answer:
malfutka [58]3 years ago
8 0
<h2>Answer:</h2>

<u>D. All of the above </u>

<h2>Explanation:</h2>

Precambrian time incorporates Earth's history from birth up to 590 million years back. That is, the Precambrian traverses 90% of Earth's presence. Fossilized microscopic organisms and blue-green growth demonstrate that crude life existed in any event 3,500 million years prior, and potentially prior.

However, it took another 2,100 million years for eukaryotic cells (plant and creature cells) to show up. These single-celled animals (protozoa) commanded the seas. Multi-cell creatures (spineless creatures) didn't advance until exceptionally late in Precambrian time, around 700 million years prior or 2,800 million years after life initially started on Earth.  

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The arrows in a food chain point from the organism ____________ the energy to the organism ___________ the energy
melamori03 [73]

Answer:

1. Supplying

2. Taking

Explanation:

Food chain is a linear relationship between organisms that depicts the flow of energy from one organism to another. In a food chain, organisms are arranged in trophic levels where arrows pointing to the right direction (➡) are used to show that the organim the arrow is pointing to eats the organism behind it.

Hence, according to this question, arrows in a food chain point from the organism SUPPLYING the energy to the organism TAKING the energy.

6 0
2 years ago
Why must males inherit colorblindness or hemophilia from their mothers?
sdas [7]
Men must inherit colorblindness or hemophilia from their mothers because colorblindness and hemophilia are located on the X chromosome, which are inherited from their mother.
7 0
2 years ago
Goiters may occur due to iodine insufficiency, but other causes are possible. Which of the following would NOT tend to result in
AleksAgata [21]

Answer:

Option A

Explanation:

Thyroid is primarily caused by lack of iodine but there are other reasons as well that lead to increased size of the thyroid gland. Some of these reason is

a) over- or underproduction of thyroid hormones

b) Nodules in the glans

Some times, due to overstimulation immune system itself attack the thyroid gland thereby producing excess thyroxine and hence causing  the thyroid to swell

Thus, Option A is correct

4 0
2 years ago
_________is severe pain and constriction about the heart, usually radiating to the left shoulder and down the left arm and creat
White raven [17]

Answer:

Heart attack

Explanation:

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This is caused when a blood clots blocks blood flow to the heart thereby leading makes the tissue to loss oxygen and die.

The symptom of heart attack are;

pain in the chest, neck, back or arms, fatigue, lightheadedness, abnormal heartbeat and anxiety, nausea.

Treatment ranges from surgery, medication , rehabilitation e.t.c.

7 0
3 years ago
Explain how a dead organism may become a fossil.
MrMuchimi
When the organism dies in a moist or wet area the organism gets covered in mud and the mud hardens like a rock. 
6 0
3 years ago
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