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Alex73 [517]
3 years ago
5

Embryonic stem cells are

Biology
1 answer:
Yuliya22 [10]3 years ago
6 0
Embryonic stem cells (ES cells or ESCs) are pluripotent stem cells derived from the inner cell mass of a blastocyst, an early-stage pre-implantation embryo. Human embryos reach the blastocyst stage 4–5 days post fertilization, at which time they consist of 50–150 cells. Hope I’ve helped ;)
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Theory of Plate Tectonics
masha68 [24]

Answer:

northwest

Explanation:

the largest plate, the Pacific Plate is moving north west relative to the plate that holds North America. i also did this recently<3

4 0
3 years ago
During the cell cycle, A. DNA is replicated before mitosis begins. B. DNA is replicated once before mitosis and again before cyt
saw5 [17]

Answer:

The correct answer is A    DNA  is replicated before mitosis begins

Explanation:

DNA replication is one of the most significant event of a cell cycle. .DNA replication occur in the S phase or synthesis phase of the cell cycle.

       DNA is replicated once per cycle to maintain to normal chromosome number in daughter cells.

     DNA is replicated to form two new DNA molecules which are then equally distributed in each daughter cell during the mitosis phase.

5 0
3 years ago
Scientific laws explain how and why something occurs on a scientific level true or false
andrew-mc [135]

Your question has been heard loud and clear.

Not all scientific laws explain how and why something occurs on a scientific level , only scientific theories explain how and why something occurs on a scientifc level.

So , it is false.

Thank you

5 0
3 years ago
Large layers of cross-bedded sand can be indicative of a __________ environment.
k0ka [10]
Layers of cross-bedded sand can be indicative of a DESERT environment wind is responsible for the formation of these sedimentary structures. Sand dunes preserved in rocks can be quite large. These structures form as a result of the migration of dunes due to the action of the wind. Dunes are not often preserved but a few can be observed in thick sandstone units. 
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3 years ago
When studying phenotypic variations due to the environment, it is necessary to compare organisms with identical genotypes. in ad
hoa [83]
Yeah the answer is A.
7 0
3 years ago
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