The correct answer is option D. Calcium.
Low bone density can be due to a lack of calcium thus requiring supplementation.
It's shown to increase stamina
Notify the authorities, leave the location, suggest another activity.
Negative attitude may hamper attempts to keep the environment clean and habitable to human being through exhibiting improper behaviors such as pollution and improper disposal of waste etc.
<h3>What is Pollution?</h3>
This is defined as the introduction of foreign substances or contaminants into the environment and are of various types such as water pollution etc.
Negative attitude such as smoking in a public place pollutes the air and the oxygen needed to breathe by individuals becomes contaminated which may lead to the risk of contracting various types of diseases.
Read more about Pollution here brainly.com/question/24704410
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The answer is 10 billion. <span />
