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slega [8]
2 years ago
9

Which activity is an example of a chemical change?

Biology
1 answer:
Pavlova-9 [17]2 years ago
4 0

Answer:

An old penny rusting

Explanation:

A penny forming rust is the penny being chemically altered and changing form as opposed to dissolving sugar in water, which is still sugar, just mixed with water. It doesn't change the chemical makeup of the water or sugar.

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3 years ago
A population of 20 monarch butterflies colonizes a meadow. The meadow's carrying capacity for monarch butterflies is 5,000 indiv
Oksi-84 [34.3K]

Answer:

The only possible answer is D, which states that the population will reach 5000 and after that the growth will stabilise (exactly what would hapen in a logistic growth).

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7 0
3 years ago
Read 2 more answers
Hummingbirds drink nectar from flowers. As they pass from flower to flower,
notka56 [123]
C. Mutualistic relationship

Flowers and hummingbirds have a mutualistic relationship where both benefit. Flowers produce food in the form of nectar (sugar and water) to attract hummingbirds which, in turn, move pollen for the plant (pollination).
3 0
3 years ago
A fragment of a strand of nucleic acid isolated from a silk moth species contains the base sequence CAGACT. The strand must be f
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If the strand of Nucleic acid does not have a U - it must be DNA. Any sequence with a U is considered to be RNA. Therefore, CAGACT is considered to be a strand of DNA.
3 0
2 years ago
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Why might lower folic acid (a precursor to Tetrahydrofolate) levels in pregnant women lead to arn increased risk of birth defect
Bas_tet [7]

Answer:

The correct answer is - it is essential to produce red blood cell and development of the spinal cord and brain.

Explanation:

Folic acid is natural form of vitamin B9 which is essential for producing red blood cells therefore the level of this vitamin should be in proper amount as in fetuses it is crucial for the various organs to develop,

The neural tube, spinal cord, and brain growth requires appropriate amount    of folic acid in pregnant women. Low level of this vitamin can leads to the risk of various disease in baby

Thus, the correct answer is -it is it is essential to produce red blood cell and development of the spinal cord and brain.

4 0
3 years ago
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