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pentagon [3]
3 years ago
8

What do scientist use to study pre-Cambrian time?

Biology
2 answers:
julia-pushkina [17]3 years ago
8 0

Answer:

Rocks.

Explanation:

Scientists study rocks from the Precambrian period because isn't really a significant fossil record from the Precambrian.

barxatty [35]3 years ago
7 0
They study rocks for sure
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What is the part of the cell cycle process by which chromosomes in a cell nucleus are separated into two identical sets of chrom
Damm [24]

Answer:

Mitotic phase

Explanation:

Cell cycle is composed of interphase and mitotic phase. Interphase is aphase of cell preparation. It is subdivided into:

  • G1 (gap 1 phase)-the cell grows and becomes larger
  • S phase- replication of DNA, duplication of centrosomes
  • G2 (gap 2 phase)-proteins and oranelles are made

Mitotic phase is phase of cell division, chromosomes are separated, daughter cell get identical sets of chromosomes. It is followed by cytokinesis-separation of cytoplasm. Stages of mitosis are:

  • prophase-condensation of chromatin into chromosomes,  the nuclear envelope breaks down, mitotic spindle formation
  • metaphase-the chromosmes line up (metaphase plate)
  • anaphase-the siste chromatides move toward opposite cell poles
  • telophase-the nuclear envelope forms again, cell division is almost complete
3 0
3 years ago
The spinal cord is made up of
skelet666 [1.2K]

Answer:

Grey and White Matter.

Explanation:

When looking at an image of trasnverse section of the spinal cord the grey matter is almost butterfly shapped and it has the central canal in the middle. The white matter is surrounding the butterfly shaped, grey matter.

4 0
3 years ago
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. How long has it taken barren rock to become paradise?
Simora [160]

Answer:

Volcanoes are created over approximately 10,000-500,000 years by thousands of eruptions -- each lava flow covering the one before it. In the case of oceanic island volcanoes, lava erupts first from fissures, or cracks, on the deep ocean floor. The flows continue to build up and finally an island emerges from the sea.

Explanation:

i licked it up... ;-)

4 0
3 years ago
How long are spices good for after expiration date?.
sdas [7]

Answer:

Whole spices will stay fresh for about four years, while ground spices run between three and four years

Explanation:

6 0
2 years ago
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Desired traits expressed gene
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1) desired trait

2) Gene

3) expressed

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