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4 years ago

What was the source of the microscopic "animalcules" described by Leeuwenhoek?

1 answer:

3 0

With his superior light adjusting techniques, Leeuwenhoek was able to construct microscopes which could magnify over 200 times, enabling him to perceive small "animalcules" or bacteria in water.

Furthermore, in a letter, he reports how he had discovered in the plaque of two old men who had never brushed their teeth in their lives “an unbelievably great company of living animalcules, a-swimming more nimbly than any I had ever seen up to this time. The biggest sort. . . bent their body into curves in going forwards. . . Moreover, the other animalcules were in such enormous numbers, that all the water. . . seemed to be alive.”

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What are some examples of harmful or undesirable mutations?

Fudgin [204]

Answer:

I can think of only 1 sorry :(

Explanation:

The one that I thought of is cystic fibrosis it a mutation that makes a sticky substance in the lungs and it makes it hard to breathe but you can drink a certain thing that helps the lungs. Bad news: there is no treatment Good news: It is no contagious.

5 0

3 years ago

Which of the following are abiotic factors that shape ecosystems? <br> Group of answer choices

cestrela7 [59]

Temperature, light and water

8 0

3 years ago

How to do this question plz answer

goldfiish [28.3K]

Answer:

Energy comes from foods rich in carbohydrate, protein and fat.

Explanation:

The source of energy that is used to power the movement of contraction in working muscles is adenosine triphosphate (ATP), the body's biochemical way to store and transport energy.

3 0

3 years ago

“PKU” is an inherited disease caused by a recessive allele. If a woman and a man are both carriers, where P is the normal allele

user100 [1]

Answer:

Option A, 1/64

Explanation:

The genotype of a carrier female would be Pp

The genotype of a carrier male would be Pp

When these two adults are crossed , the following offspring are produced

Pp x Pp

PP, Pp, Pp, pp

Thus out of four children 3 children have normal phenotype but two are carrier.

So probability of having one normal child (with genotype PP) is $\frac{1}{4}$

So the probability of three normal children is

$\frac{1}{4} *\frac{1}{4} *\frac{1}{4} \\= \frac{1}{64}$

Hence, option A is correct

6 0

4 years ago

A very short period of extremely rapid expansion, called , is thought to have occurred when the universe was about 10-38 second

adell [148]

Inflation is a sudden and extremely rapid expansion of the universe that occurred in a tiny fraction of a second during the universes's first second to existence. More specifically, inflation is thought to have occurred as the strong and electroweak forces, froze out, from the GUT force when the universe was a mere 10-38 second old.

6 0

4 years ago