There's 39 chromosomes in the sperm cell. Why? Because sperm cells are gametes and therefore they are haploid cells meaning they have half the number of chromosomes of a regular cell or diploid cell.
78 / 2 = 39
Answer:
A. Early signs of life on earth
Explanation:
The Hadean, before the Archean, is the first geologic eon of Earth. It began with the formation of the Earth about 4600 million years ago and ended 4,000 million years ago. The planet had just formed and was still very hot due to high volcanism, a partially molten surface. Some geologists labels the period before the earliest-known rocks on Earth. At the end of it much cooler surface temperature and the formation of solid rock enabled to flaurish the life.
The answer to this question would be: <span>Nitazoxanide
</span><span>Nitazoxanide is a broad antiparasitic drug that can be used to treat infection of Giardia lamblia or Cryptosporidium parvum. It also a broad antiviral can be used for viral infection.
Another drug that can be used for Giardia infection would be Metronidazole.</span>
Answer:
A. The earth orbiting the moon (false)
B. Earth revolving around the sun (true)
C. The sun revolving around the earth (false)
D. The moon orbiting the earth (true)
E. The moon revolving around the earth (true)
F. The earth orbiting the sun (true)
<h3>sorry if I'm wrong anyways</h3>
Geiger-Muller tube is instruments requires you test three times the background of the work area.
<u>Explanation</u>:
These detectors are gas filled detectors and hence requires time for responding to the value. This time is taken because during this period it collects the electric charges and features of the electric circuit. It also gets stabilized during this period. This device has thumb rule i.e one must wait or hold for at the least 3 times the time constant before getting the precise and accurate reading. The time constant order is 10 seconds for the ionization chamber but for the Geiger counter it can vary from seconds to greater than 20 seconds
