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Grace [21]
3 years ago
15

It has been demonstrated that environmental uva and uvb levels have resulted in this feature in homo sapiens:

Biology
1 answer:
Sedaia [141]3 years ago
4 0

Answer:

variation in skin color.

Explanation:

The human skin color is determined genetically depending on the amount of melanin. However pigmentation can occur as a results of exposure to uv rays that causes induced pigmentation.  

The sun emits two types of ultra violet rays which can reach can reach the skin namely the uva and uvb. Both type of rays can damage the skin if unprotected. Due to this there was evolution against the damaging rays. More melanin that provides a natural sunscreen to the people leaving in the tropic environment.

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In vascular plants, cells coordinate to form specialized __________ that deliver food and water to the entire plant structure.
kari74 [83]
<h3><u>Answer;</u></h3>

Tissues

In vascular plants, cells coordinate to form specialized tissues that deliver food and water to the entire plant structure.

<h3><u>Explanation</u>;</h3>
  • Vascular plants are plants that contain specialized vascular tissue.
  • Vascular tissues in vascular plants are specialized tissue that transports or carries water and nutrients. Vascular tissue is divided into xylem  and phloem.
  • Xylem is the vascular tissue that carries water upward from the roots to every part of a plant while phloem is the vascular tissue that transports solutions of nutrients carbohydrates produced by photosynthesis through out the plant .

5 0
3 years ago
If a rat births several offspring after fertilization, why will these offspring NOT be genetically identical to the mother
Nataly_w [17]

Answer: The offspring will not be genetically identical to the mother because the process of mitosis mixes chromosomes frome the mom and dad.

7 0
3 years ago
Based on your own investigation, what challenges do you think scientists face when classifying new organisms?
Whitepunk [10]

Answer:

hope this helps

Explanation:

Classification of organisms is a hard task cause many organisms have their differences and similarities, whereby making it very complicated in classifying organisms.. All living organisms are classified into groups based on very basic, shared characteristics..

5 0
3 years ago
The same breeder crosses a red flower and blue flower. What percent of the seeds from
adell [148]

Answer: 50%

Explanation:

Alright, you know that the RR genotype gives red flowers. This happens in one combination, so 1/4 of the offspring will have red flowers.

6 0
2 years ago
Each daughter cell resulting from mitotic cell division has the exactly same genetic composition. Each daughter cell resulting f
Bogdan [553]
It is true because mitosis creates exact replicas with no genetic variation.
6 0
3 years ago
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