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Dvinal [7]
3 years ago
6

The umbilical cord connects the embryo to the

Biology
2 answers:
grin007 [14]3 years ago
3 0
B.fetus hope i could help


Elenna [48]3 years ago
3 0
The answer is C. Placenta.
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Please help ASAP! Describe at least one way in which each of Earth’s subsystems was altered during the Precambrian era.
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The Precambrian era envelopes the major bulk of the history of the Earth, beginning from the creation of the planet approx 4.5 billion years ago and terminating with the origination of composite, multicelled forms of life approximately 4 billion years after.

The Precambrian refers to the earliest of the geologic ages that are signified by the distinct layers of sedimentary rock. The Earth was about more than six hundred million years old when life started. The planet had cooled down from its native molten state, creating a solid crust and oceans formed by water vapor in the atmosphere.

At about three billion years ago, the atmosphere of the Earth was virtually devoid of oxygen. At approximately 2.4 billion years ago, oxygen was discharged from the seas as a waste product of photosynthesis by cyanobacteria. The levels of the gas slowly raised, attaining about 1 percent around two billion years ago.

Approximately 800 million years ago, the levels of oxygen attained about 21 percent and started to breathe life into more composite species. The oxygen-rich ozone layer was also created, protecting the surface of the Earth from the harmful solar radiation.


8 0
3 years ago
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An American cockroach (Periplaneta americana) can begin to turn away from approaching danger, such as a hungry toad lunging towa
JulsSmile [24]

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The roaches antennas

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3 years ago
Which muscles are also known as the smooth muscles
adoni [48]

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involuntary muscle

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Involuntary muscles are those that cannot be controlled by will or consciousness and are frequently associated with organs that contract and relax slowly and regularly. Because there are no striations when viewed under a microscope, involuntary muscles are also known as smooth muscles or non-striated muscles.

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type of bacteria shown is spirochaetes

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