Answer the following question given this paragraph: Sperm are tiny cells. In fact, they are the smallest of all human cells. They have a structure that suits them well to perform their function. Q: What type of cells are the smallest of all human cells? Choices: - egg - dna - meristematic - sperm A:
sperm
Answer the following question given this paragraph: O 3(g) O(g) + O 2(g) The reactive oxygen atoms recombine with molecular oxygen to complete the ozone cycle. The presence of stratospheric ozone decreases the frequency of skin cancer and other damaging effects of ultraviolet radiation. It has been clearly demonstrated that chlorofluorocarbons, CFCs (known commercially as Freons), which were present as aerosol propellants in spray cans and as refrigerants, caused depletion of ozone in the stratosphere. This occurred because ultraviolet light also causes CFCs to decompose, producing atomic chlorine. The chlorine atoms react with ozone molecules, resulting in a net removal of O3 molecules from stratosphere. This process is explored in detail in our coverage of chemical kinetics. There is a worldwide effort to reduce the amount of CFCs used commercially, and the ozone hole is already beginning to decrease in size as atmospheric concentrations of atomic chlorine decrease. While ozone in the stratosphere helps protect us, ozone in the troposphere is a problem. This ozone is a toxic component of photochemical smog. The uses of ozone depend on its reactivity with other substances. It can be used as a bleaching agent for oils, waxes, fabrics, and starch: It oxidizes the colored compounds in these substances to colorless compounds. It is an alternative to chlorine as a disinfectant for water. Q: The presence of what stratospheric gas layer decreases the frequency of skin cancer and other damaging effects of ultraviolet radiation? Choices: - plasma - cumulonimbus - smog - ozone A:
ozone
Q: Answer the following question given this paragraph: As you can see in Figure below , both body plans have radial symmetry. Some cnidarian species alternate between medusa and polyp forms. Other species exist in just one form or the other. Q: What type of species can alternate between medusa and polyp forms? Choices: - mollusks - crocodilian - chordata - cnidarian A:
A: cnidarian
Question: Answer the following question given this paragraph: Enzymes are needed to speed up biochemical reactions in organisms. They work by lowering activation energy. Q: What do organisms need to speed up biochemical reactions? Choices: - genes - carbohydrates - hormones - enzymes A:
Answer: enzymes
*Question*
Answer the following question given this paragraph: Preserved traces can include footprints, burrows, or even wastes. Examples of these types of fossils, called trace fossils are picture below ( Figure below and Figure below ). Q: Footprints, burrows, and waste are considered what type of fossils? Choices: - movement fossils - crater fossils - morphology fossils - trace fossils A:
**Answer**
trace fossils
Q: Answer the following question given this paragraph: Sound is a form of energy that travels in waves through matter. The ability to sense sound energy and perceive sound is called hearing . The organ that we use to sense sound energy is the ear. Almost all the structures in the ear are needed for this purpose. Together, they gather sound waves, amplify the waves, and change their kinetic energy to electrical signals. The electrical signals travel to the brain, which interprets them as the sounds we hear. Q: What type of energy travels through matter in wave form? Choices: - vibrational - magnetic - light - sound A:
A: sound