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iren [92.7K]
2 years ago
9

One half-life of a radioactive isotope has passed when:

Biology
1 answer:
stepladder [879]2 years ago
5 0

Answer:

C the number of daughter nuclei is half the number of parent nuclei.

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What substances transported by plants 1) xylem vessels and trachieds? 2) sieve tubes of phloem?
Licemer1 [7]

Answer:

Explanation:

xylem vessels transport water and nutrient from roots to the other parts of the plant

trachieds are elongated in the xylem of vascular plant that play role in the transport of water and mineral salt

seive tube are the elongated living cells of the phloem in the flowering plant  they are the conduits of food (mostly sugar) transport

5 0
3 years ago
How do invasive species disrupt non-native ecosystems?
Sloan [31]
There are many ways they can disrupt their new environments.

They can often carry diseases or parasites that native species are unequipped for. A good example of this is cats being brought to Australia, a continent with no native felidae. Cats are one of the main carriers of toxoplasmosis and many species in Australia had not evolved alongside felidae and were relatively unequipped to handle these parasites if their immune system was vulnerable.


They can also cause issue simply because they are so different, and the animals and plants living I. These areas are simply unable to defend themselves or keep up as a result. Such as pigs (and other animals brought over by humans) eating dodo bird eggs (these birds roosted on the ground) and domestic cats overhunting for sport.

Hope this helps a bit! It's a pretty broad topic and definitely one worth researching even more
8 0
3 years ago
Which of the following is a trace gas?<br><br> nitrogen<br> oxygen<br> ozone<br> hydrogen
myrzilka [38]

<u>Answer:</u>

<em>Hydrogen and ozone are both examples of trace gases. </em>

<u>Explanation:</u>

Trace gases are present in minor quantities in the <em>earth’s atmosphere and all the gases except nitrogen, oxygen and argon </em>which make up the major portion of earth’s atmosphere are considered trace gases.

The respective percentages of nitrogen, oxygen and argon in the atmosphere are<em> 78.1%, 20.9% and 0.934%.</em>  The process that produce trace gases is called source and  the process that removes trace gas from the <em>atmosphere is called sink. </em>

<em>Some other examples of trace gases are carbon dioxide, neon, helium etc. </em>

5 0
3 years ago
Read 2 more answers
Choose all the answers that apply.
zvonat [6]

Answer:

Anorexia can cause  tooth decay , heart damage , headaches ,

cancer

Explanation:

3 0
3 years ago
In humans tongue rolling is dominant to the inability to tongue roll. If a heterozygous tongue roller and a non-tongue roller ha
ella [17]
In humans, tongue rolling is dominant to the inability to tongue roll. The chances a child will be a non-tongue roller is C. 0.5.
3 0
3 years ago
Read 2 more answers
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