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kvasek [131]
3 years ago
8

Dna, the genetic material of living organisms, is damaged by light in the

Biology
2 answers:
asambeis [7]3 years ago
6 0
Ultraviolet sun rays it damages the cells and can cause skin cancer.
gayaneshka [121]3 years ago
6 0

Answer: ... in the UVB light exposure.

Explanation: When DNA is exposed to UVB radiation, thymine bases that are close to each other in the genetic sequence bond together, and this bond <u>cannot be copied</u> by the enzimes responsible for reproducing the genetic material. In the skin, it causes sunburns and stimulates the production of melanin. Luckily, DNA is only damaged by 0,1% of those UVB radiation photons, but even this percentege is enough to cause a sunburn anyway.

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The tree includes the most recent common ancestor of all living species of bears (branch point 1). what does this tell you about
inessss [21]
If we take a look at the phylogenetic tree of bears presented in the picture above, we can see that the branch number one is the common ancestor to all living bear species, which means that the whole group has a uniform origin. and the phylogenetic tree has a root.
Therefore, the group is monophyletic, not <span>polyphyletic ( meaning that the whole group has the same origin) and not paraphyletic ( there is no group that has been excluded from the tree).</span>

8 0
3 years ago
What is the major sink reservoirs for the nitrogen cycle?
Rudiy27

All of these components are reservoirs of carbon. The cycle is usually discussed as four main reservoirs of carbon interconnected by pathways of exchange. The reservoirs are the atmosphere, terrestrial biosphere (usually includes freshwater systems), oceans, and sediments (includes fossil fuels).

8 0
3 years ago
If water molecules inside and outside of a cell became non polar , how would the transport of materials in and out of the cell b
postnew [5]
<h2>Answer:</h2>

The water will move in and out freely. The material transport which is due to the water transport will be affected.

<h3>Explanation:</h3>
  • Water is a partially polar molecules. Many ionic compounds and ions travel inside and outside the cell due to attachment with water molecule.
  • As well as water movement is controlled due to its polar nature through cell membrane. and the cytoplasm and outer environment is separate due to non polar cell membrane.
  • If the water become non polar then the movement through cell membrane will be easy for water. And the molecules dissolved in water will also be transported uncontrollably.

4 0
3 years ago
1) The density of a substance is the ratio of its mass to its volume. The formula for density is: D = mass/volume. If the densit
Agata [3.3K]
Yes d =the mass value and
6 0
3 years ago
Unless a series of sedimentary rock layers has been overturned, which layer is usually the oldest?
Xelga [282]

the layer on the top. the layer with the most minerals.

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