BIOLOGY MIDDLE SCHOOL

What is the prevailing westerlies

Answers

Answer 1
Answer: Prevailing Westerlies are the winds in the middle latitudes between 35 and 65 degrees latitude. They tend to blow from the high pressure area in the horse latitudes towards the poles. These prevailing winds blow from the west to the east steering extratropical cyclones in this general manner.

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How does mitosis differ in plants and animals?

Answers

Well, you are already know that cell plate in plant cells divides it in half and later it becomes a cell wall.
"In animal cells, the cell membrane pinches in the middle and the cytoplasm divides. In plant cells, the appearance of a cell plate shows that the cytoplasm is being separated." - Glencoe Science Book 7th Grade "Life Science" 

The above refers to the division of the cytoplasm, which is called cytokinesis. Although cytokinesis accompanies mitosis, it is not strictly part of it; mitosis is nuclear division. 

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In animal cells there is an organelle, the centriole, which is not found in plants. The centriole divides in two during prophase, and each daughter-centriole moves to a position that will be one pole of the spindle. 

However, the centriole is not essential for mitosis in animal cells, and plant cells do not have one. 

The term "microtubule organizing center" (MTOC) is used for any structure that forms the spindle. It is not yet clear what the MTOC is in plants.

Which of these changes do not involve forming or breaking chemical bonds? A. burning and melting
B. rusting and cutting
C. burning and digesting
D. boiling and melting

Answers

The correct answer to this question D - The only changes listed which do not involve forming or breaking chemical bonds would be boiling and melting. Boiling and melting are physical changes rather than chemical changes, so no new products are formed.

Hello, the correct answer to your question is, D. boiling and melting

I hope this helped!

What ecosystem concept isillustrated by symbiotic
relationships?
A. natural selection
B. interdependence
C. competition

Answers

The answer is C- competition.
B. Interdependence.
Explanation:
Symbiotic relationships refer to a long term, close interaction betweeen two different biological organisms, be it mutualistic, parasitic or commensalistic. In each kind of symbiotic relationship, atleast one organism benefits. Yet,each kind of symbiotic relationship illustrates interdependence, in whicn both organisms or atleast one organism requiire the other to survive.

Why don't offspring always look like their parents?

Answers

They can get genes from their ancestors or grandparents

Which type of melanin is produced by the version of the MC1R gene most prevalent among people of African ancestry?

Answers

The MC1R gene gives directions for producing a protein known as the melanocortin 1 receptor. This receptor performs an essential function in normal pigmentation. The receptor is mainly situated on the melanocytes surface that are unique cells, which generate a pigment known as melanin.  

Melanin is generated by the melanocytes located in the basal layer of the epidermis. The MC1R monitors the production of both pheomelanin and eumelanin.  

Final answer:

The MC1R gene most prevalent among people of African ancestry produces eumelanin, a type of melanin. This melanin is responsible for their darker skin pigmentation, especially with UV exposure which stimulates melanocyte's production of more melanin.

Explanation:

The type of melanin produced by the version of the MC1R gene most prevalent among people of African ancestry is eumelanin. Melanin occurs in two forms: eumelanin which is black or brown and pheomelanin which provides a red color. People of African ancestry produce more melanin, specifically eumelanin, which provides a darker pigmentation. The MC1R gene plays an essential role in the synthesis of melanosomes, causing skin pigmentation.

For instance, when skin is exposed to the Ultraviolet (UV) rays from the sun, the UV rays stimulate keratinocytes to secrete chemicals which in turn stimulate melanocytes. The melanocytes increase the production of melanin which results in the darkening of the skin, also known as sun tan.

Learn more about Eumelanin production here:

brainly.com/question/33866036

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Is gender an inherited or acquired trait?

Answers

its a acquired trate i just did this last week 
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How do animals use pheromones???
With increased concentration, temperature, and pressure, there is also an increased chance that a chemical reaction will occur. What do all these factors have in common?A. increased temperatureB. increased energyC. increased particle collisions
Two students completed an experiment to determine if pesticide use at local farms was causing fish kills in a local pond. The steps of the experiment are listed below. 1.Select different locations to collect water samples in the pond. 2.Collect a 5-mL water sample at 8 am at a different location each day for 10 days. 3.Measure the amount of pesticide present in each sample using the same measurement tools. After analyzing their data, the students conclude that pesticide runoff from farms is not causing the fish to die in the pond. Which of these statements best describes why their conclusion is not valid? a. The amount of water collected each day was the independent variable. b. The daily location for sample collection was not a controlled variable. c. Pesticide measurements were the dependent variable. d. The time of sample collection was not a controlled variable.