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Komok [63]
3 years ago
10

Why are there four seasons?

Biology
2 answers:
7nadin3 [17]3 years ago
4 0

     The reason there are four seasons is that the earth is tilted 23.5 degrees on its axis. For half the year, this tilt causes one half of the earth to tilt toward the sun while the other half tilts away. This changes every six months, creating the seasons.

dlinn [17]3 years ago
3 0

We have seasons because of our planets axis of rotation. Or in other words, the scientific word for this is <u>obliquity </u> . The earth is tilted at the angle of 23.5 degrees.  

Hope this helps! :)

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Suppose the femur bone of an animal has 1,000 atoms of carbon-14 when the animal dies. How many atoms of carbon 14 will be prese
shtirl [24]

Answer:

After 6000 years, approximately 500 atoms of carbon-14 will be left in the femur bone of an animal which had 1000 atoms of carbon-14 when the animal died.

Explanation:

The half-life of a radioactive isotope of an element is the time taken for half the atoms present in a given amount of the element to undergo decay or disintegration. For example, the half-life of carbon-14 isotope is 5730 years. This means that, if there are 100 atoms of carbon-14 present in a given sample of a material, in the next 5730 years, approximately, 50 atoms of carbon-14 will be left in the material.

Since the half-life of radioactive isotopes are constant, these radioactive isotopes are used in the determining the ages of ancient life-forms as well as rocks.

In the given example, after 6000 years, approximately 500 atoms of carbon-14 will be left in the femur bone of an animal which had 1000 atoms of carbon-14 when the animal died.

8 0
3 years ago
What is the medical term for the process or procedure that destroys or inhibits disease-causing microorganisms to prevent infect
Simora [160]

Answer: Sterilization.

Explanation:

Sterilization is the process that kills, or deactivates all forms of life so then a product is considered free of viable microorganisms. This process must be designed, validated and carried out to ensure that it is capable of eliminating the microbial load of the product.

Since sterility cannot be demonstrated without causing the complete destruction of the products, <u>sterility is considered when the probability of a product being contaminated is acceptably remote.</u> A critical product is considered sterile when the probability of a microorganism being present in an active or latent form is equal to or less than 1 in 1,000,000 (sterility safety factor 10^-6).

Agents that kill microorganisms are called microbicides or more commonly called "germicides". If the agent kills bacteria, it is called a bactericide. And if it kills fungi, then it is called a fungicide. It is important to consider than <u>after an exposure of the sterilized object to the air or its surroundings, it will have become contaminated again with microorganisms.</u>

Examples of sterilization include physical methods and chemical methods. Physical methods include:

  • Wet heat (in steam autoclave)
  • Dry heat (in sterilization oven)
  • Radiation (gamma radiatio, electron beam, X-ray, ultraviolet, microwave, white light)

Chemical methods include a variety of chemicals in liquid and vapor form, for example:

  • Hydrogen peroxide
  • Chlorine dioxide
  • Ozone gases
  • Ethylene oxide
  • Propylene oxide
  • Peracetic acid
5 0
2 years ago
These are models of a plant cell and an animal cell. How can you use the models to help you describe the cell parts that are dif
OLga [1]

Answer:

Chloroplasts are what give plants their green color. The second major difference between plant and animal cells is the cell wall. While both plant and animal cells have a cell membrane, on plants have a cell wall.

8 0
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A client on the psychiatric unit sits alone most of the day. the nurse approaches the client. as the nurse gets approximately 3
puteri [66]
Since the client is throwing tantrums and outburst, it is best to calm the client but taking an action of having to talk to him or her or try to get closer to him or her will likely provoke him or her into doing what he or she is currently doing. It is best for the nurse to calm the client by having to tell him or her that the nurse will leave and will be back as soon as he or she calms down.
5 0
3 years ago
How is  eukaryotic RNA processed before leaving the nucleus 
Paha777 [63]

Answer:

Messenger RNA, or mRNA, leaves the nucleus through pores in the nuclear membrane. ... During mRNA processing, the introns (non-coding regions) of the pre-mRNA are removed, and the exons (the coding regions) are spliced together. Additionally, a 5' cap and a 3' poly A tail are added to the pre-mRNA

Explanation:

6 0
3 years ago
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