Ques: Q: Unlike energy, what happens to matter in ecosystems? Read this paragraph and choose the correct option from the provided answers: Living things need nonliving matter as well as energy. What do you think matter is used for? It's used to build bodies. It's also needed to carry out the processes of life. Any nonliving matter that living things need is called a nutrient . Carbon and nitrogen are examples of nutrients. Unlike energy, matter is recycled in ecosystems. In the figure below, you can see how ( Figure below ). Choices: - it is filtered - it does not exist - it is destroyed - it is recycled A:
Ans: it is recycled

Ques: Q: What is the force of attraction between things that have mass Read this paragraph and choose the correct option from the provided answers: Gravity has traditionally been defined as a force of attraction between things that have mass. The strength of gravity between two objects depends on their mass and their distance apart. Choices: - friction - motion - momentum - gravity A:
Ans: gravity

Ques: 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:
Ans: octet rule

Ques: Q: How much unpolarized light does a polarized filter block? Read this paragraph and choose the correct option from the provided answers: Polarized filters block 50% of unpolarized light. If two filters are oriented so that their polarization axes are aligned, how much light is transmitted? What about if their axes are oriented perpendicular to each other? Draw two diagrams below to support your answers. Choices: - 40 % - 60 % - 100% - 50% A:
Ans:
50%