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3 years ago

The Clean Water Act does not ensure high water quality throughout the nation because it does not _____.

Biology

2 answers:

ch4aika [34]3 years ago

6 0

the correct answer is A.have a means of enforcement

bogdanovich [222]3 years ago

3 0

The correct option is A.

The Clean Water Act was enacted in 1972 in the United States. The Act addressed the discharge of pollutants into water bodies. The principal goal of the Act is to restore and maintain the integrity of the water bodies in the nation. The Act was a federal law and it is administered together with the state governments. But the Act has not been able to ensure high quality of water throughout the nation because it lacks a mean of enforcement.

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What is a constraint?

NeTakaya

Answer:

c. a factor that limits or puts restrictions on a design.

Explanation:

constraint - a limitation or restriction.

7 0

2 years ago

The distance between Jupiter and the sun is usually measured in astronomical units. Which answer choice below best defines an as

Lostsunrise [7]

An astronomical unit (AU) is the approximate distance from the earth to the sun. The answer is D.

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3 years ago

Read 2 more answers

How many variations do you observe?

masya89 [10]

Answer:

Variation, in biology, any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences (genotypic variation) or by the effect of environmental factors on the expression of the genetic potentials (phenotypic variation). Variation may be shown in physical appearance, metabolism, fertility, mode of reproduction, behaviour, learning and mental ability, and other obvious or measurable characters.

chromosomes or by differences in the genes carried by the chromosomes. Eye colour, body form, and disease resistance are genotypic variations. Individuals with multiple sets of chromosomes are called polyploid; many common plants have two or more times the normal number of chromosomes, and new species may arise by this type of variation. A variation cannot be identified as genotypic by observation of the organism; breeding experiments must be performed under controlled environmental conditions to determine whether or not the alteration is inheritable.

Genotypic variations are caused by differences in number or structure of Environmentally caused variations may result from one factor or the combined effects of several factors, such as climate, food supply, and actions of other organisms. Phenotypic variations also include stages in an organism’s life cycle and seasonal variations in an individual. These variations do not involve any hereditary alteration and in general are not transmitted to future generations; consequently, they are not significant in the process of evolution.

Explanation:

Brainliest please?

8 0

3 years ago

Lesch-Nyhan syndrome is an X-linked, recessive condition caused by mutation of the HPRT1 gene responsible for purine metabolism.

Elanso [62]

Answer:

B. The father did not contribute a sex chromosome to his daughter due to nondisjunction of the sex chromosomes. The daughter is XO and her only X chromosome came from her mother, who was a carrier.

A.The mother's X chromosomes failed to separate during meiosis, and the daughter inherited two X chromosomes with the Lesch-Nyhan mutation. The father contributed no sex chromosomes.

Explanation:

As seen in the question above, a little girl was diagnosed with Lesch-Nyhan syndrome, which is an X-linked recessive condition caused by a mutation in the HPRT1 gene responsible for purine metabolism.

The little girl's parents do not have the syndrome, and no one in the little girl's paternal family presented this syndrome, however, we know that the maternal grandfather of the little girl's mother had the syndrome, which means that it was the mother's genetic material that contributed to the development of the syndrome in the little girl. This was because the little girl did not receive any X chromosomes from her father, but she inherited the two X chromosomes from her mother that coded for the Lesch-Nyhan mutation. This happened because the mother's X chromosome disjuction did not occur during meiosis I.

As shown above, the father did not contribute any sex chromosomes to his daughter, which means that the daughter is XO and her only X chromosome came from her mother, who was a carrier.

3 0

3 years ago

During nitrification, _____.

Serga [27]

During nitrification, ammonia is changed back into nitrate.

Nitrification is a three-step process of oxidation of ammonia. It is an aerobic process performed by small groups of autotrophic bacteria (Nitrosomonas, Nitrobacter).
First step- ammonia to hydroxylamine,
Second step-hydroxylamine to nitrite,
Third step-nitrite to nitrate.
Nitrification together with ammonification is part of a nitrogen cycle.

3 0

3 years ago