3 years ago

There is no need to get immunizations anymore because viruses are no longer a problem like they were in the past true or false

Biology

1 answer:

anygoal [31]3 years ago

4 0

That is false. Vaccines are very important.

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Option B. Eubacteria is the correct answer.

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Which structure does this organism use for movement?

LuckyWell [14K]

It's 100% not B.... but other than that the organism must be provided. protozoans use flagellum (whip-like structure), amoeba use pseudopods (false feet), and cilia (hair-like structure) are used for eukaryotic cells.

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Strontium-90 has a half life of 29 years, how much strontium-90 is left from the Chicago pile reactor that was active around 87

agasfer [191]

Answer:

The answer is below

Explanation:

The half life of a substance is the time required by that substance to reduce to half of its initial value. The half life is calculated using the formula:

$N(t)=N_o(\frac{1}{2} )^\frac{t}{t_\frac{1}{2} } \\\\where\ N(t)=quantity\ of\ substance \ remaining, N_o=initial\ quantity\\of\ substance, t=time\ and \ t_\frac{1}{2}=half\ life\ of\ substance$

Given that t = 87 years, half life = 29 years, therefore the quantity of strontium-90 left is:

$N(t)=N_o(\frac{1}{2} )^\frac{87}{29} \\\\N(t)=N_o(\frac{1}{2} )^\frac{t}{t_\frac{1}{2} } \\\\N(t)=N_o(\frac{1}{2} )^3\\\\N(t)=\frac{1}{8} N_o$

That is one-eight of Strontium 90 would be left after 87 years

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2 years ago

An experiment in which only one variable is changed is a(an) __________ experiment.

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D. controlled
is the right answer because an experiment in which an observer tests a hypothesis by looking for changes carried by alterations to a variable.

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Hey there!

Your answer is:

There are alternate versions of a gene.

Hope this helps!
Have a great day! (:

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