Answer:Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds. When it bonds only with hydrogen, it forms compounds called hydrocarbons. Carbon can form single, double, or triple covalent bonds with other carbon atoms.
Explanation:
The correct answer is - D. A drought kills all the plants in an area, leaving bare land.
If there's such a big drought that will manage to kill off all the vegetation in an area and leave bare land behind it, than the land will be degraded in no time. Once the land is left without its natural protection that the roots of the vegetation provide, the land will be exposed to high rates of and erosion. The erosion will be very quick and the top layers of the soil will be moved away with every wind and rainfall that will appear. That will degrade the land to a very high degree, making it totally unusable and it will need lot of time to eventually recuperate.
The extra oxygen is used to restore muscle fibers to their pre-exercise state by doing all of the following except facilitating calcium release from the sarcoplasmic reticulum in the muscle fiber. Thus, the correct option is B.
<h3>What is Respiration?</h3>
Respiration may be defined as the process of acquiring oxygen from outside the body and utilizing it in the process of breakdown of food sources for cellular needs.
The extra oxygen works in the muscle fiber by replenishing the ATP, restocking the myoglobin, and supplying the ATP used to replenish glycogen stores in the muscle fiber.
Therefore, the correct option for this question is B.
To learn more about Respiration, refer to the link;
brainly.com/question/18169685
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<span>#1) With reference to the role of oncogenes, explain how the normal controls over the cell cycle can be lost.
Answer: The way that cell cycle can be lost is by going through changes in the activity of cell cycle regulators. Cancer causes different types of mutations. There are two types of cell cycle regulators that can promote the development of cancer:
-Positive Regulators that can be over activated (become oncogenic).
-Negative Regulators (tumor suppressors) which can be inactivated.
I hope it helps, Regards. <span /><span>
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The answer is D. Instinct
Eagles evolved better over the years to hunt their targets easier, which explains why they have sharp talons, they instinctively use them to hunt their prey.
