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SVEN [57.7K]
3 years ago
12

8. If a farmer plants the same crop in a field year after year, the soil becomes less fertile. What (1 point)

Biology
1 answer:
Anton [14]3 years ago
6 0

Answer:

loss of nutrients

Explanation:

1. Loss of top soil by erosion

2. Nutrient mining

3. Physical degradation of soil (poor structure, compaction, crusting and waterlogging etc.

4. Decrease in organic matter content and soil bioactivity

5. Loss of nutrients through various routes

Modern agriculture had used up the nutrients in our soil and now our food supply was suffering.

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Why does the male parent's genes determine the sex of the baby?
Julli [10]
Consider this:

Each parent has two sex chromosomes.
The mother, as a female, has chromosomes XX.
The father, a male, has XY.

The mother will pass on one sex chromosome to the baby, as will the father.
The mother can only pass on an X.
The father, however, has a 50/50 chance of passing on an X or Y.
XX would make a female and XY would make a male.

Simply put, the sex chromosome from your mother is fixed, it's going to be an X no matter what. It's which sex chromosome your father passes on that determines your sex.

7 0
3 years ago
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Why is it important to center the object you want to look at in your field of view before changing to a higher magnification obj
Lesechka [4]

Answer:

B. So you can always see the entire object at the higher magnification

Explanation:

A microscope is used to view objects smaller than the naked or unaided eyes can see. The objective lens, in conjunction with the occular or eye lens, is used to achieve this purpose. The objective lens are of different magnifications as follows: 10X, 40X, 100X etc.

However, as the magnification increases i.e. higher objective, the object in the field of view becomes smaller and less focused. Hence, the object in the field of view must first be centered at a lower magnification/objective lens before changing to a higher one in order for the entire object to be seen at a higher magnification.

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3 years ago
What happens when we breathe? Where does oxygen go?
Lina20 [59]

in our lungs

and throughout our blood stream

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3 years ago
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How developmental genes play role in evolution?
ehidna [41]

Answer:

Genetic variations that alter gene activity or protein function can introduce different traits in an organism. If a trait is advantageous and helps the individual survive and reproduce, the genetic variation is more likely to be passed to the next generation (a process known as natural selection).

Explanation:

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What substance can be formed through the ionic bonding of an anion and a cation
PtichkaEL [24]
A salt can be formed

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3 years ago
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