Answer:
Radioactive Elements
In elements with more than 83 protons, all of the isotopes are radioactive. ... The force of repulsion among all those protons makes the nuclei unstable. Elements with more than 92 protons have such unstable nuclei that they don't even exist in nature.
Explanation:
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Answer:
C: The top of a saturated aquifer
Explanation:
The water table is the upper surface of the zone of saturation. This zone of saturation is where pores and fractures of the ground get saturated with water. It can also be simply explained as, the upper level, below which the ground is saturated.
Answer:
What are the options?
Explanation:
We can't pick a statement if we don't know what they are.
Answer:
They're still VERY relevant.
Explanation:
In 2019, an estimated 34,800 new HIV infections occurred in the United States. HOWEVER new HIV infections declined 8% from 37,800 in 2015 to 34,800 in 2019. In 2012, the US Food and Drug Administration gave the green light to using daily pills of an HIV medication called Truvada (emtricitabine/tenofovir) to prevent infection. It proved more than 85% effective when taken on schedule. New drugs are still being developed, here's a link from the
FDA explaining some different types of new TREATMENT medications:
https://www.fda.gov/news-events/press-announcements/fda-approves-new-hiv-treatment-patients-limited-treatment-options
Here's a link for medications that PREVENT HIV/AIDS:
https://www.nature.com/articles/d41586-021-00618-7#:~:text=In%202012%2C%20the%20US%20Food,effective%20when%20taken%20on%20schedule.
Answer: The correct option is A (chromosome Number is reduced from diploid to haploid)
Explanation:
In sexual reproduction, offspring are produced by fusion of two different sex cells which usually come from two different parents. These sex cells are know as gametes.
Meiosis is a type of cell division that gives rise to gametes in which the chromosome number is halved. Thus, the gamete cell is said to contain a haploid number (n) of chromosomes.
A diploid cell has two sets of chromosomes: one from the male parent and the other from the female parent. When a diploid cell undergoes meiosis the following occurs:
--> the chromosomes replicate once and
--> the nucleus and cell duplicate ( divide equally) twice.
As a result, the diploid parent cell gives rise to four haploid gamete cells. Therefore the statement "chromosome Number is reduced from diploid to haploid ' is true concerning meiosis I.
