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Andrej [43]
3 years ago
13

Tại sao tóc có mầu đen

Biology
1 answer:
Akimi4 [234]3 years ago
6 0

Answer:

Melanin is responsible for black colour of hair.

Explanation:

Hair is black in colour because it is determined by the amount of a pigment present in hair is called melanin. If eumelanin which is a type of melanin, present in hair, it gives people black or brown hair. If the receptor is not activated or is blocked in the hair, then melanocytes make pheomelanin instead of eumelanin and then the black or brown hair colour did not occurs so we can conclude that melanin is responsible for black colour of hair.

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The source of passive immunity that a mother gives to her infant through breast milk is known as __________.
maks197457 [2]

Answer:

The correct answer is- IgA

Explanation:

There are five types or class of antibodies found in the human body these are IgA, IgM, IgD, IgE, and IgG. Out of these five class IgA antibody is found in an abundant amount in the mother's milk or colostrum.

Infant take this antibody from the mother through breastfeeding which protects the infant from may pathogenic microbes. The immunity in which antibodies are taken from outside is called passive immunity.

Therefore the passive immunity source that is given by the mother to baby through breast milk is called IgA.

3 0
2 years ago
Julio is studying the bald eagle, which has a binomial name of Haliaeetus leucocephalus. Using the modern system of
Lubov Fominskaja [6]

The kingdom is Animals. The genus is Haliaeetus. The species is leucocephalus are the statements which Julio can make about the bald eagle.

The option C is the correct answer.

Explanation:

Given that Bald eagle has binomial name as Haliaeetus leucocephalus.

Modern classification of binomial nomenclature is given by Carl Linnaeus.

From the modern system of classification the sequence is as kingdom, phylum, class, order, family, genus and species. The classification of bald eagle is:

Kingdom - Animalia

Phylum - chordata

class - Aves

Order- Accipitriformes

family - Accipitridae

Genus - Haliaeetus

species - leucocephalus.

The two word name of the species having genus first followed by species is binomial nomenclature which Julio has used for bald eagle as Haliaeetus leucocephalus.

4 0
3 years ago
The concept of endosymbiosis (chloroplast & mitochondria) is widely accepted. What kind of relationship is it?
melamori03 [73]

Answer:

mutualistic

Explanation:

The interaction between two organisms in which both the organism gets benefitted from each other is called a mutualistic relationship. This mutualistic relationship is seen in the concept of endosymbiosis.

According to the endosymbiotic theory chloroplast and mitochondria are evolved by engulfment of different bacteria by ancestral cells. Then these bacterial remained in a mutualistic relationship with each other and the ancestral cell evolved into a eukaryotic cell.

So as mitochondria and chloroplast live with a symbiotic relationship with eukaryotic cells, therefore, it is considered as mutualistic relationship.

4 0
3 years ago
An organism that eats other organisms is called a (n)
Fantom [35]

Answer:

Carnivore im pretty sure

Explanation:

4 0
3 years ago
Read 2 more answers
Which choice correctly lists the factors that affect the gravitational attraction between objects?
mixas84 [53]
B. distance and mass because as distance increases, the gravitational pull decreases and when it decreases, the gravitational pull increase. Also the mass increases, so does the attraction and opposite if it decreases. 
3 0
3 years ago
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