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Scrat [10]
3 years ago
12

What determines how many covalent bonds two atoms can make?

Biology
1 answer:
alukav5142 [94]3 years ago
7 0
2 atoms?
The group number (valency) determines how many electrons the atom wants to share as they all want to bond to achieve the noble gas configuration.
From groups 1-4 (the top number in the periodic table), that is how many they want to gain, and 5-7 six minus the number is how many they want to gain. Group 8 are noble gases so already have a full outer shell.
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13. Explain why a characteristic which helps an animal to live longer will generally tend to become more
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Since it will help the individual live longer, there is a greater chance that it will reproduce than those with lesser favorable traits. Thus the next generation will resemble the parents with the favorable triat more.

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8 0
3 years ago
What are the smallest blood cells in the frog?
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Answer:

Unlike typical mammalian red blood cells, those from amphibians, such as frogs, contain a DNA-bearing nucleus that is visible in the center of the cell. The circulatory system of amphibians is rather unusual, their hearts having three chambers, two atria, and a single ventricle.

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The design of the amphibian circulatory system is curious because blood accumulates oxygen in the lungs and is then returned to the heart before being pumped into the rest of the circulatory system. Therefore, a mixing between oxygenated and deoxygenated blood occurs as blood returning to the heart from the lungs is mixed with incoming blood from the body. Frogs handle this situation by having a very slow metabolism and by absorbing some oxygen through their skin. In addition, the ventricle does have some directional control over the distribution of the blood.

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The presence of a nucleus in amphibian red blood cells allows researchers easy access to large quantities of amphibian DNA. Frog blood has both a solid and a liquid portion. The liquid plasma carries solid elements such as red and white blood cells. Blood can be collected from frogs and the red blood cells isolated by centrifugation. After removal of the residual plasma, purified cells can be treated with specific enzymes and detergents to digest the cellular envelope and release DNA from its protein complex. The DNA is then useful for scientific studies and experiments.

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Explanation:

4 0
3 years ago
what variable is measured in a experiment? A. independent variable B. experimental variable c. Dependent variable
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C. Dependent variable

The independent variable is what you want to change (ex amount of light given to plants)

The dependent variable is what changes because of the independent variable (ex the height of the plants)

So Independent is what you change, Dependent is what you measure
5 0
3 years ago
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Answer:food undergo a chemical reaction by bond breaking example for starch to amylose is hydrolysis reaction where there is breaking of 1,4 glycosidic bondd

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