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Daniel [21]
3 years ago
5

(14 points) What nationwide step that greatly reduced dangerous automobile emissions was mandated by the U.S. Clean Air Act?

Biology
2 answers:
kirill [66]3 years ago
8 0

Using electricity instead of fossil fuels

vampirchik [111]3 years ago
3 0

Answer: a

Explanation:

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Never mind i dont need help
Leno4ka [110]

Answer:

okay buddy, have fun with that.

Explanation:

thanks

6 0
2 years ago
A gene (gene X) undergoes a mutation which converts if from wild-type to mutant. Then a second mutation in the gene Y occurs whi
Tcecarenko [31]

Answer:

b. forward mutation, suppressor mutation

Explanation:

When the nucleotide sequence of an organism is altered, it is called as mutation. It can be caused by DNA damage or replication errors. In forward mutation, the wild type allele is converted to a mutant version such that the gene product is non functional or its not produced at all. Suppressor mutation is the second mutation which reverses the phenotypic effects of the previous mutation. This process is called as synthetic rescue.

Since here gene X was converted into a mutant form by the mutation, it had undergone forward mutation. When gene Y was mutated, the function of gene X was  restored which ultimately also restored the phenotype hence it is an example of suppressor mutation.

4 0
2 years ago
An element has an atomic mass number of 16 and an atomic number of 7. what is the elements protons and neutrons?
damaskus [11]

Answer:

7 protons, 7 neutrons (READ EXPLANATION)

Explanation:

The atomic number represents how many protons are in an element. Generally speaking, elements have the same number of protons and neutrons. So, an element with the atomic number of 7 will have 7 protons and 7 neutrons.

However it is possible for an element to have a differing number of neutrons (an element will always have the same number of protons because that number is how the element is identified in the first place). Elements that have a number of neutrons that is not the same as the atomic number are called isotopes.

7 0
2 years ago
Which is one source of the sediments that form sedimentary rocks?
statuscvo [17]
The answer is “particles in new rocks”
7 0
3 years ago
Read 2 more answers
What is a fixed allele
Oksana_A [137]

A fixed allele is an allele that is the only variant that exists for that gene in all the population

8 0
3 years ago
Read 2 more answers
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