Q: What has a bigger impact on water quality, natural events or human activity? Read this paragraph and choose the correct option from the provided answers: Natural events, like storms, volcanic eruptions and earthquakes can cause major changes in water quality. But human-caused contaminants have a much greater impact on the quality of the water supply. Water is considered polluted either when it does not support a human use, like clean drinking water, or a use for other animals and plants. The overgrowth of algae, known as an algal bloom , can result from the runoff of fertilizer into bodies of water. This excess of nutrients allows the algae to grow beyond control, bring harm to the rest of the ecosystem. Choices: - water quality - all of the above - natural events - human activity A:
human activity

Q: Which ductless gland releases secretions directly into surrounding tissues and fluids? Read this paragraph and choose the correct option from the provided answers: Glandular Epithelium A gland is a structure made up of one or more cells modified to synthesize and secrete chemical substances. Most glands consist of groups of epithelial cells. A gland can be classified as an endocrine gland, a ductless gland that releases secretions directly into surrounding tissues and fluids (endo- = "inside"), or an exocrine gland whose secretions leave through a duct that opens directly, or indirectly, to the external environment (exo- = "outside"). Choices: - marrow gland - pineal gland - adrenal glands - endocrine gland A:
endocrine gland

Q: Q: What two measurements are multiplied to find the area of a rectangle? Read this paragraph and choose the correct option from the provided answers: Assume you are finding the area of a rectangle with a length of 6.8 m and a width of 6.9 m. When you multiply the length by the width on your calculator, the answer you get is 46.92 m 2 . Is this the correct answer? No; the correct answer is 46.9 m 2 . The correct answer must be rounded down so there is just one digit to the right of the decimal point. That's because the answer cannot have more digits to the right of the decimal point than any of the original measurements. Using extra digits implies a greater degree of precision than actually exists. The correct number of digits is called the number of significant figures . To learn more about significant figures and rounding, you can watch the videos at the URLs below. Choices: - depth and width - volume and mass - length and depth - length and width A:
A: length and width

Question: Q: All elements are most stable when their outermost shell is filled with electrons according to which rule? Read this paragraph and choose the correct option from the provided answers: Chemical Reactions and Molecules All elements are most stable when their outermost shell is filled with electrons according to the octet rule. This is because it is energetically favorable for atoms to be in that configuration and it makes them stable. However, since not all elements have enough electrons to fill their outermost shells, atoms form chemical bonds with other atoms thereby obtaining the electrons they need to attain a stable electron configuration. When two or more atoms chemically bond with each other, the resultant chemical structure is a molecule. The familiar water molecule, H2O, consists of two hydrogen atoms and one oxygen atom; these bond together to form water, as illustrated in Figure 2.9. Atoms can form molecules by donating, accepting, or sharing electrons to fill their outer shells. Choices: - quartet rule - string rule - coupling rule - octet rule A:
Answer: octet rule

*Question*
Q: When the wind deposits sand, it forms small hills, what are these hills called? Read this paragraph and choose the correct option from the provided answers: When the wind deposits sand, it forms small hills. These hills are called sand dunes ( Figure below ). For sand dunes to form, there must be plenty of sand and wind. Sand dunes are found mainly in deserts and on beaches. Choices: - sand tunnels - snow banks - mud puddles - sand dunes A:
**Answer**
sand dunes

Q: Snakes use what anatomical structure to smell scents in the air? Read this paragraph and choose the correct option from the provided answers: Most reptiles have good eyesight and a keen sense of smell. Snakes smell scents in the air using their forked tongue (see Figure below ). This helps them locate prey. Some snakes have heat-sensing organs on their head that help them find endothermic prey, such as small mammals and birds. Staring into the Beautiful Cold-Blooded Eyes of Reptiles at http://www. environmentalgraffiti. com/news-reptile-eyes is a pictorial display of numerous reptile eyes. Choices: - forked tails - branched tongue - forked eyes - forked tongue A:
forked tongue