(Q).
Answer the following question given this paragraph: Flickr:EvelynGiggles. Antifreeze lowers the freezing temperature of the water in car radiators . CC BY 2.0. Q: What does antifreeze do to the freezing temperature of the water in car radiators? Choices: - raises it - keeps it constant - foresees it - lowers it A:
(A).
lowers it

(Q).
Answer the following question given this paragraph: 22.11.4 Chryosophytes Chryosophytes are the most abundant unicellular algae in the oceans. They are also one of the biggest components of plankton, a free-floating collection of microorganisms, eggs, and larvae. As photosynthetic organisms, they produce a significant amount of atmospheric oxygen. The reproduction cycle of chryosophytes is particularly interesting. Note that diatoms reproduce both asexually and sexually. Since diatoms have a rigid cell wall with an outer layer of silica (found in sand and glass), the daughter cells produced by mitosis must fit inside the original cell wall. Therefore, each generation of diatoms is smaller than the one before. The reduction in size continues until the diatoms produce sexually, producing a zygote which eventually grows to the original size as it matures. Q: What are the most abundant unicellular algae in the oceans? Choices: - chlorella - sporozoans - staurikosaurus - chryosophytes A:
(A).
chryosophytes

(Q).
Answer the following question given this paragraph: In the previous lesson, we discussed pure substances and mixtures. We indicated that the components of a mixture could be separated by physical means, but the components of a pure substance could not. Pure substances can only be broken down further through chemical means. In this lesson, we list several methods for separating mixtures. We will also be looking at chemical changes which alter the chemical identity of a substance, and how to recognize when a chemical change is taking place. Q: While components of a mixture can be separated by physical means, the components of a pure substance can only be broken down through what means? Choices: - mechanical - radiation - thermal - chemical A:
(A).
chemical