Ques: Q: Cephalochordates have a notochord and nerve cord but not a? Read this paragraph and choose the correct option from the provided answers: Cephalochordata: Cephalochordates include the lancelets ( Figure below ), fish-like marine animals often found half-buried in the sand. Cephalochordates have a notochord and nerve cord but no backbone. Choices: - digestive system - nervous system - brain - backbone A:
Ans: backbone

Ques: Q: What two types of atoms bond to form sulfate minerals? Read this paragraph and choose the correct option from the provided answers: Sulfate minerals contain sulfur atoms bonded to oxygen atoms. Like halides, they can form in places where salt water evaporates. Many minerals belong in the sulfate group, but there are only a few common sulfate minerals. Gypsum is a common sulfate mineral that contains calcium, sulfate, and water. Gypsum is found in various forms. For example, it can be pink and look like it has flower petals. However, it can also grow into very large white crystals. Gypsum crystals that are 11 meters long have been found. That is about as long as a school bus! Gypsum also forms at the Mammoth Hot Springs in Yellowstone National Park, shown in Figure below . Choices: - oxygen and carbon - oxygen and calcium - carbon and sulfur - oxygen and sulfur A:
Ans: oxygen and sulfur

Ques: Q: What is the term for matter that does not let any light pass through? Read this paragraph and choose the correct option from the provided answers: Opaque matter is matter that does not let any light pass through it. Matter may be opaque because it absorbs light, reflects light, or does some combination of both. Choices: - dark - mirrored - reflective - opaque A:
Ans: opaque

Ques: Q: The components of what keep their own identity when they combine and can usually be easily separated? Read this paragraph and choose the correct option from the provided answers: The components of a mixture keep their own identity when they combine. Therefore, they usually can be easily separated again. Their different physical properties are used to separate them. For example, oil is less dense than water, so a mixture of oil and water can be separated by letting it stand until the oil floats to the top. Other ways of separating mixtures are shown in Figure below and in the videos below. Choices: - alloy - solution - compound - mixture A:
Ans:
mixture