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KIM [24]
3 years ago
13

What are isotopes and why are they important?

Biology
1 answer:
MariettaO [177]3 years ago
6 0

Isotopes of an element all have the same chemical behavior, but the unstable isotopes undergo spontaneous decay during which they emit radiation and achieve a stable state. This property of radioisotopes is useful in food preservation, archaeological dating of artifacts and medical diagnosis and treatment.

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List six charateristics of living things
solong [7]
We can use the word RINGER to memorize the characteristic of living things.

Respiration - the ability to breathe and respire.
Irritability - the ability to detect and react to stimulus
Nutrition - taking in nutrients (eg. Food) for energy to growth, repair etc
Growth - the permanent increase in size and mass
Excretion - to get rid of toxic, waste or excess materials
Reproduction - to make more of that organism.

In addition, there is also movement, which is an action which causes a change in place or position.

Only the organisms with these characteristics are categorized as living things.
7 0
3 years ago
Frozen water (ice) has less density than liquid water. How does this property of water affect life on earth? Ice floats on the s
madreJ [45]
If the water is salty like in the oceans, as the water freezes the salt is pushed out making the water denser making it sink to the bottom in a current to keep climate cool and the surface currents warm the artic. The way it effects life is, it makes a passageway over the freezing water across so that you won't freeze to death swimming. And it helps migration too. The Sub-zero waters keep algae from growing, which is good because most are hibernation.

I hope this helped!

6 0
3 years ago
What is on a transplanted organ that causes the transplant recipient's body to reject it?
Delvig [45]

Answer:

Major histocompatibility complex (MHC) antigens

Explanation:

The process in which recipient body rejects the transplanted organ is called a allograft rejection or transplantation rejection.

A transplanted organ contains Major histocompatibility complex (MHC) antigens which are required to be accepted by the recipient's body to function properly but T cells in recipient's body become alloreactive and recognize MHC antigens (donor-derived antigens) as foreign and starts making antibodies against it. Which means the recipient's body is rejecting the  transplanted organ.

Hence, the correct answer is "Major histocompatibility complex (MHC) antigens".

8 0
3 years ago
10.
ipn [44]
Nervous system is the body system that is involved in coordinating and controlling body movements
4 0
2 years ago
What is the difference between directional selection and disruptive selection
morpeh [17]
Directional selection is where one phenotype is favored, so an example would be "a population of madagascar hissing cockroaches suffers heavy predation from lizards. Because their heads are small, the lizards are unable to eat the very largest adult cockroaches, and instead prey upon small and medium sized adults, so as a result the large cockroaches are favored and live". 
Meanwhile, disruptive selection is where both extreme phenotypes are favored, an example would be "a population of rabbits can have black fur, white fur or grey fur. This population of rabbits lives in an area of white rocks. When a local volcano erupts, black volcanic rock now dots the landscape amongst the white rocks. Now the black and white rabbits live longer because the black and white spots on the landscape camoflauge them. The two extreme phenotypes are being favored."
8 0
3 years ago
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