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nirvana33 [79]
3 years ago
5

Why can only one sperm enter an egg

Biology
1 answer:
Iteru [2.4K]3 years ago
3 0
Because at that point, the egg would already be fertilized. Now in cases like identical twins, two sperm must enter the egg at the exact same time.
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Experimental studies reveal that double-stranded DNA can exist in three different helical forms known as A, B, and Z DNA. Why do
FromTheMoon [43]

Answer:

The correct answer is - B-DNA is the most common form of the DNA present in the cell and a good approximation of the structure of DNA in the cell.

Explanation:

The B- DNA is a form of the DNA that is explained by Watson and crick by the double-helical structure model. B-DNA is the predominant form of the DNA out of the three forms of the DNA which are B-DNA, Z-DNA, and A-DNA.

B-DNA is is provide a good approximation of the structure of DNA in a cell and its most common form of DNA in a cell that makes it the most studied and focused form of DNA.

Thus, the correct answer is -  B-DNA is the most common form of the DNA present in the cell and a good approximation of the structure of DNA in the cell.

8 0
3 years ago
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Using terms and concepts that you have learned in this course, examine 10 aspects of your own diet, and explain any changes you
olga_2 [115]

Answer:

Increase awareness of what I eat

Explanation:

  1. Eat more offal because it has CoQ 10. This is a powerful antioxidant and it will increase my energy and boost my immune system.
  2. Drink more green tea since it has theanine which is and amino-acid that will cross the blood brain barrier. This will increase my alertness and give me a sense of well-being.
  3. Eat more berries it has a wide range of differing antioxidants. It's important for scavenging reactive oxygen species in the body that could damage the cells.
  4. Drink more water flush toxins out. This will also keep me hydrated and keep the blood body levels normal.
  5. Eat more green leafy vegetables because it has iron, important for making haemoglobin.
  6. Eat more nuts it has magnesium and potassium which are important for over 300 enzymatic reactions in the body and also critical for mood, alertness, sleep and pain management.
  7. Eat more fish it has iodine which is a trace component but will support thyroid health and improve immunity.
  8. Switch to pink salt get trace minerals that are not always available in iodized salts. These are important for the conduction of electrical impulses in the brain and increase reaction response and shorten reaction time.
  9. Eat two hours before bed to reduce indigestion, this will also decrease weight gain as the food is moved along the digestive system long before it is time to go to sleep.
  10. Cut out refined carbohydrates to reduce empty calories and incorporate whole grain and natural sweeteners, if any. This provides a more nutrient dense diet and also provide plenty of fiber to aid digestion and bowel movements. It also provide food for the good gut bacteria that helps to improve our immune system.
4 0
3 years ago
How many meters are in 7.8 km
kherson [118]

Answer:

There are 7800 meters in 7.8 km

6 0
2 years ago
Read 2 more answers
_______ are chemicals released by the body that block the release or uptake of neurotransmitters necessary to transmit pain sens
AURORKA [14]
The answer is the endogenous opiate. 
The human body naturally produces its own opiates like substances and uses them as neurotransmitters. These substances include endorphins, enkephalins, and dynorphin, often collectively known as endogenous opioids. Endogenous opioids modulate our reactions to painful stimuli.
7 0
3 years ago
HELP PLEASE I HAVE A WEEK LEFT OF SCHOOL I DONT WANNA FAIL
Oksana_A [137]

Answer:

I am too lazy to do this, but I am assuming you were supposed to do this in class. I will give you ideas.

Why is soil important?  Soil is our life support system. Soils provide anchorage for roots, hold water and nutrients. Soils are home to myriad micro-organisms that fix nitrogen and decompose organic matter, and armies of microscopic animals as well as earthworms and termites.

What is soil erosion?  Soil erosion is a naturally occurring process that affects all landforms. In agriculture, soil erosion refers to the wearing away of a field's topsoil by the natural physical forces of water (Figure 1) and wind (Figure 2) or through forces associated with farming activities such as tillage.

what human activities are responsible for soil erosion happening at advance rates?     Ploughing, unsuitable agricultural practices, combined with deforestation and overgrazing, are the main causes of human-induced soil erosion

What are some effects on soil loss?  The effects of soil erosion go beyond the loss of fertile land. It has led to increased pollution and sedimentation in streams and rivers, clogging these waterways and causing declines in fish and other species. And degraded lands are also often less able to hold onto water, which can worsen flooding.

What can be done to prevent soil erosion?   Maintaining a healthy, perennial plant cover.

Mulching.

Planting a cover crop – such as winter rye in vegetable gardens. ...

Placing crushed stone, wood chips, and other similar materials in heavily used areas where vegetation is hard to establish and maintain.

Explanation:  Hope this helps and have a great day

3 0
3 years ago
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