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madam [21]
3 years ago
9

According to scientific evidence, earth’s earliest atmosphere lacked oxygen. Over time, oxygen was added to the atmosphere.

Biology
1 answer:
iVinArrow [24]3 years ago
7 0
B and a are the correct answers
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Please help!
Otrada [13]

I do not understand your question fully because there might be some context missing to it:

Having more nuclei is not something caused by the lack of a process or stage. Some muscle cells usually fuse together, which means they become one. But before they became one, each had their own nuclei. And when they fused, each one kept their nuclei, making one cell with more than one nuclei.


Those cells are called multinucleated cells.




Hope it helped,



BioTeacher101

8 0
3 years ago
Cells need oxygen to make energy. Oxygen-rich blood is transported to tissues. When the oxygen is dropped off, it needs to move
ikadub [295]

Answer:

capillaries help the blood containing the things a cell needs

Explanation:

9 0
3 years ago
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Our Sun has a surface temperature of about 9000 degrees Celsius, and is G2 Star.
Ksenya-84 [330]

Answer:

Sun is classified as a G2 V star, with G2 standing for the second hottest stars of the yellow G class of surface temperature about 5,800 kelvins (K) and the V representing a main sequence, or dwarf, star, the typical star for this temperature class.

8 0
3 years ago
What is a hypotheses
Luden [163]

Answer:

An educated guess before doing an experiment

3 0
3 years ago
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After being rushed to the hospital, charlene is told she has an ectopic pregnancy. what does this mean?
Morgarella [4.7K]
This means that the fertilized egg has implanted in the fallopian tube and is growing outside of the uterus. An ectopic pregnancy occurs when the fertilized egg settles and grows in any location other than the inner lining of the uterus. Most of these cases occurs in the Fallopian tube (tubal pregnancy). If untreated ectopic pregnancy can be a medical emergency. 
7 0
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