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Alina [70]
3 years ago
10

Fossils evidence shows that ___________________were the first photosynthetic organisms on earth,about 1.2 billion years ago.​

Biology
2 answers:
tankabanditka [31]3 years ago
7 0
There is suggestive evidence that photosynthetic organisms were present approximately 3.2 to 3.5 billion years ago, in the form of stromatolites, layered structures similar to forms that are produced by some modern Cyanobacteria
alekssr [168]3 years ago
4 0

Answer:

cyanobacteria

Explanation:

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Which one of the following physical quantities is formed after dividing mass of volume?
Mkey [24]

Answer:

Density

Explanation:

Density is refer to how much space an object in Mass take in volume.

It is mass if an object divided by volume.

It usually in g/cm3

8 0
2 years ago
During which phase of meiosis does each of the following events occur?
lubasha [3.4K]

Answer:

(a) crossing over: Meiosis I, Recombination  

(b) chromatids separate at their centromeres and migrate to opposite poles: Meiosis II, Anaphase II

(c) chromosomes become aligned in pairs at the equator: Meiosis II, Metaphase II

Explanation:

Homologous recombination is a type of genetic recombination that occurs during meiosis (formation of ovum and sperm cells). The paired chromosomes of the male and female parents are aligned so that similar DNA sequences intersect. This crossing over produces an exchange of genetic material, which is an important cause of the genetic variability observed in the offspring.

Meiosis II: Anaphase II. The centromeres separate and the daughter chromatids - now individual chromosomes - move to the opposite poles of the cell. The centromeres separate, and the two chromatids of each chromosome move toward the opposite poles in the spindle.

Meiosis II: Metaphase II. Chromosomes are accommodated in the equatorial plate of metaphase, similar to what happens in mitosis. They are attached to the already fully formed meiotic spindle. Each chromosome is aligned in the equatorial plate of the metaphase, as it happens in mitosis.

6 0
3 years ago
This is the "Passage" from the last question I posted :)
podryga [215]

Answer:

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Explanation:

3 0
3 years ago
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"during a head to toe examination, the nurse should expect which musculoskeletal finding in the older adult
Colt1911 [192]
Head exception if there’s a blindness of the rolled eyes
8 0
3 years ago
If an organisms Haploid (Gamete) cell contains 34 chromosomes, how many chromosomes are in its Diploid (Somatic) cells?
ivolga24 [154]

Answer:

68

Explanation:

..................

8 0
2 years ago
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