Metalloids, such as silicon, can be found on the periodic table along the border between metals and nonmetals. Which of the following best describes the physical and chemical properties of metalloids? A. Metalloids have some of the physical and chemical properties of both metals and nonmetals. B. Metalloids have exactly the same physical and chemical properties as nonmetallic elements. C. Metalloids have exactly the same physical and chemical properties as metallic elements. D. Metalloids have physical and chemical properties that are completely different from both metals and nonmetals.

ans.

in united states (us), the first leading cause of death for both women and men is heart diseases that leads to more than half of the deaths. heart diseases develop due to narrow arteries, buildup of plaque in blood capillaries that arises difficulties in blood flow.

the second leading cause of deaths in us is cancer that affects individuals of all ages. it develops due to uncontrolled growth and spread of tumor cells, which results in death if the not controlled or treated.

the third leading cause of deaths in us is copd or chronic obstructive pulmonary disease. it includes difficulty in breathing, chest infections, and persistent cough. smocking is a leading cause of copd and around 80% of copd deaths occur due to smoking.

thus, the correct answer is 'option). cancer, copd, and heart disease.'