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Nikolay [14]
2 years ago
11

Explain the principle of hard immunity

Biology
1 answer:
ZanzabumX [31]2 years ago
5 0
Ex. Only works for diseases that spread directly between people (like measles)
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Describe a structural adaptation that affects mouth shape.
murzikaleks [220]
How your teeth are shaped and formed
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3 years ago
PLS HELP ITS DUE TODAY
Black_prince [1.1K]

Answer:

BENEFITS:

The Descriptive investigation is used to describe a natural system when nothing or very little is known about the system. Like observing a new specimen in the microscope and describing it by observing the specimen.

A comparative analysis is used to compare two or more variable in nature by collecting data like observing the different colors of the rocks. It provides the data to show the similarity and dissimilarity of the population.

The Experimental investigation is used where experiments are performed to test and answer the scientific questions. The advantage is that data can be used as evidence for future research.

LIMITATIONS:

<u>descriptive  method  of  investigation </u>

It cannot be used to correct variable or be used to determine causes and  effect  of  the  problem

<u>experimental  method  of  investigation </u>

It might create an artificial situation that do not always represent the real  life situation

<u>comparative  method  of  investigation </u>

It  is not easy to control other variables that might influence the study

<em>Ngl, I just copy and pasted these answers from another brainly question</em>

5 0
2 years ago
12. In our somatic (body) cells, we have ___________ chromosomes, but in our sex cells (sperm &amp; eggs), we have half the numb
Sliva [168]

Answer:

12. In our somatic (body) cells, we have 2N chromosomes, but in our sex cells (sperm & eggs), we have half the number of chromosomes, which is N chromosomes

Explanation:

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3 years ago
What is cancer? why is it dangerous?
Ira Lisetskai [31]

Answer:

Explanation:

Cancer refers to any one of a large number of diseases characterized by the development of abnormal cells that divide uncontrollably and have the ability to infiltrate and destroy normal body tissue. Cancer often has the ability to spread throughout your body. Cancer is the second-leading cause of death in the world.

3 0
3 years ago
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explain why a father with blood group AB cannot donate for a child with blood group O when he marries a woman with blood group O
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The odds are astronomical for a father with AB(IV) to have an O(I) child. The only possible way for this phenomenon to occur is if there was a nondisjunction in the ovogenesis for the 9th chromosome and the father also had a nondisjunction for the same chromosome(A sperm cell with no 9th chromosome fertilized an ovum with two 9 chromosomes).

A person with AB cannot donate to a person with O because the receiver has antibodies(alpha and beta) that bind to the antigens on the AB blood cells, causing death.

7 0
3 years ago
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