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olga_2 [115]
3 years ago
5

Why have fossil's of some extinct organisms have been found and others haven't?

Biology
1 answer:
xz_007 [3.2K]3 years ago
7 0
Fossils only form if certain qualifications are met, and some organisms cannot meet them, so they just cease to exist, not a single sign of them. This could happen if they were organisms that decayed completely. Fossilization can include freezing, drying, and encasement, usually in tar or resin.
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When examining cells in the laboratory, you notice that a particular cell has half as much DNA as the surrounding cells. It appe
kow [346]

Answer:

G1 checkpoint

Explanation:

The cell cycle consists of the series of activities that occurs from the replication of DNA to the actual division of the cell in an organism's cell. However, the cell has been internally programmed to ensure that all conditions are in place/favorable before allowing progression into the next stage of the cell cycle. This internally controlled mechanism ia called CHECKPOINTS. This checkpoint occurs at three main stages of the cell cycle;

after G1 phase, G2 phase and during M phase.

In the G1 checkpoint, the cell ensures that the cell is in the right shape to proceed into the Synthesis phase of the cell cycle where it will double it's DNA. The checkpoint checks majorly for damage or change to the DNA before replicating it. If any error is found, that cell is halted and prevented from proceeding to the S-phase of the cell cycle.

This is the case in the question, the cell has been halted and prevented from entering the S-phase. Hence, its DNA is still the same as it started. However, the DNA of the cells surrounding it has been doubled as they have undergone DNA replication during S-phase.

4 0
2 years ago
If individual 1 in generation had the same phenotype as his wife ,what are the chances that There children would have rickets
PIT_PIT [208]
By taking a glance at the pedigree we can see that rickets transmission is not autosomal but instead it is x linked recessive.
Without wasting time look at the no of offspring of 1 that is 4 since two out of four have rickets then the chances of having rickets by method of probability is 1/2

Please mark me as brainliest.
4 0
3 years ago
What is the sequence of the mrna made from the gene 3'-ttacaggtcc-5'? uuacaggucc aatgtccagg aauguccagg ggagtggacc?
bogdanovich [222]
Aauguccagg because t becomes a, a becomes u, c becomes g, and g becomes c.
7 0
3 years ago
Is the fish the most likely classified animal group
Sonja [21]
This is false the most classified animal groups are mammals and birds. The third most classified animal group is the fish.
I hope this helps! If your confused just let me know!
7 0
3 years ago
How contractile vacuole function in osmoregulation​
e-lub [12.9K]

Answer: A contractile vacuole (CV) is an organelle, or sub-cellular structure, that is involved in osmoregulation and waste removal. ... In freshwater environments, the concentration of solutes inside the cell is higher than outside the cell. Under these conditions, water flows from the environment into the cell by osmosis. The contractile vacuole (CV) complex is an osmoregulatory organelle of free-living amoebae and protozoa, which controls the intracellular water balance by accumulating and expelling excess water out of the cell, allowing cells to survive under hypotonic stress as in pond water.

Explanation:

8 0
2 years ago
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