Answer:
Bituminous coal is the right answer.
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B. action potential
C. resting potential
b. immune system
c. skeletal system
d. endocrine system
Correct answer is c - Blood cell are produced in the skeletal system.
Red blood cells are produced on a regular basis in the bone marrow. Bone marrow is a red spongy material found within the cavities of many of the large bones of the body.
Red blood cell start as immature cell in the bone marrow and after about seven days of maturation, they are released into the bloodstream, that is, the circulatory system where they circulate for about 120 days before being replaced with new ones.
Answer:
The correct answer would be - Hydrangea plants depend on the concentration of some element which is affected by the acidic or basic nature of the soil.
Explanation:
Hydrangeas plants produce two different type of flowers blue and pink. The color of the plant depends on the pH of the soil or the acidic or basic nature of the soil. If the pH of the soil is acidic which means 5.5 or less the color of the flower would be blue and if it is near or above the 6.5 flowers would be pink.
So, it is clear that the concentration of any element that affected by the pH of the soil is responsible for the color of the flowers, in this case, it is found that the concentration of aluminum ions (Al+++) in the soil. When the soil is alkaline less concentration aluminum available for the plant and more available to the plant when the soil is acidic.
The color of hydrangea flowers is influenced by soil pH, with acidic soil producing blue flowers, and neutral to basic soil producing pink ones.
The information given about hydrangea plants and the color of their flowers is an example of how environmental factors can affect biological characteristics. Their flower color is determined by the soil pH. Acidic soil with a pH of 5.5 or less triggers the hydrangea plants to produce blue flowers, while soil with a neutral to basic pH of 6.5 and up causes the flowers to be pink.
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