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hodyreva [135]
3 years ago
6

The first organisms evolved on Earth around 4 billion years ago. The fossil record indicates that the first organisms were which

of the following?
Biology
2 answers:
Irina-Kira [14]3 years ago
6 0
Prokaryotes were the first

frozen [14]3 years ago
5 0

Answer:

prokaryotes

Explanation:

Prokaryotes were the first living beings to appear on earth, about 3 billion years ago. By evolution, prokaryotic cells gave rise to eukaryotes.

At the beginning of our planet, the first forms of life should have a very simple cellular organization. This is because the planet still had inhospitable characteristics that would be unable to support more complex life forms. In this scenario, prokaryotes would be the organisms most likely to survive and thanks to their existence, the most complex forms of life were able to exist.

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andreev551 [17]

Small fish absorb minute amounts of pesticides.

The birds of prey consume many fish to satisfy their dietary needs. The pesticides accumulate and concentrate in the bird, continued exposure overwhelm the predator.
8 0
3 years ago
What are the structures on the underside of fronds called in which the spores of ferns are produced?
Alisiya [41]
The structures are called fronds 
3 0
3 years ago
Read 2 more answers
An survey makes use of evidence, such as the footprints left behind by animal, to follow animals that re difficult to track.
gtnhenbr [62]

The correct word to fill the gap would be indirect.

In other words, an indirect survey makes use of evidence, such as the footprints left behind by animals, to follow animals that are difficult to track.

Ecological surveys are of 2 types:

  • Direct
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Direct ecological surveys have to do with studying phenomena directly and recording whatever that is observed.

Indirect surveys involve an indirect way of studying phenomena. The signs left by phenomena are observed and logically used to make deductions about such phenomena.

More on ecological surveys can be found here: brainly.com/question/1182023?referrer=searchResults

7 0
3 years ago
If a woman starts ovulating at 13 and stops at 50; a) how many ova are likely to be released from her ovaries? b) about how many
muminat
<h2>Ovulation</h2>

Explanation:

Women are born with approximately one to two million ova while female fetuses actually have far more egg cells when they are in the mother’s womb—sometimes as many as six or seven million eggs

  • When egg cells are immature they are referred to as oocytes
  • By the time a woman reaches puberty, there are only a small fraction of oocytes left—usually about 300,000
  • During the reproductive lifespan, only about 500 of a woman’s eggs are ovulated
  • The remaining eggs that are left behind die out during menopause
  • Egg death is a natural part of the cycle of the female reproductive system so prior to menopause, women typically lose a thousand or so eggs every month
3 0
3 years ago
4. When was the first STS mission?<br> O 1958<br> O 1969<br> 0 1981
faust18 [17]

Answer:

1981

Explanation:

<em>"A new era in space flight began on April 12, 1981, when Space Shuttle Columbia, or STS-1, soared into orbit from NASA's Kennedy Space Center in Florida."</em>

4 0
3 years ago
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