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Ne4ueva [31]
3 years ago
9

Which organisms were the earliest oxygen-producing life-forms?

Biology
1 answer:
mart [117]3 years ago
5 0

Answer:

The earliest oxygen-producing life forms were Cyanobacteria. Besides Cyanobacteria, these tiny organisms have another name known as blue-green algae

Explanation:Some scientists think that 2.4 billion years ago is when organisms called cyanobacteria first evolved, which could perform oxygen-producing (oxygenic) photosynthesis. Other scientist think that cyanobacteria evolved long before 2.4 billion years ago but something prevented oxygen from accumulating in the air

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During which step of meiosis do the pairs of homologous chromosomes split up, but the sister chromatids stay attached?
Degger [83]

Answer:

A) Anaphase I

Explanation:

During the Anaphase I of meiosis, the pairs of homologous chromosome split up. During this phase sister chromatids of each pair is formed and start moving towards the opposite poles. By the end of anaphase  out of each pair of sister chromatids , reaches to the poles of the spindle fibre.  During the metaphse of meiosis the chromosomes start their movements and arrange themselves between the poles and the equator of the spindle.  

4 0
4 years ago
PLEASE HELP!!!!!!!
Delvig [45]

Alright! Your being asked to rank a group by there taxonomy. You can remember this for a test by using "Dear King Phillip Came Over for Good Soup" or domain, kingdom, phylum, class, order, family, genus, species. So rank them from least to most specific. See you if you can figure it out with that!

4 0
3 years ago
All eukaryote cells belong in which group?
Wittaler [7]

Answer:

The correct answer is a. domain Eukarya.

Explanation:

Bacteria archaea and eukarya are considered as the three domains of life. Bacteria and eukarya lack a membrane-bound nucleus and other membrane bound organelle therefore they are considered in prokaryotes and organisms having membrane-bound nucleus comes under domain eukarya.

So the organism which have eukaryotic cell comes under domain eukarya. These organisms can be single cellular or multicellular and their genetic material is packed in a double membranous structure called the nucleus. So the correct answer is a. Eukarya.

7 0
3 years ago
1.
snow_lady [41]

Answer:

Population size should be the correct answer

Explanation:

3 0
2 years ago
There are no pesticides used in the U.S. today.<br> True <br> False
viktelen [127]
I’m certain that it’s false
4 0
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