Answer the following question given this paragraph: Echinoderms generally reproduce by external fertilization; regeneration is fairly common among echinoderms. Q: What is the method of reproduction for echinoderms? Choices: - pollination - internal fertilization - fragmentation - external fertilization A:
external fertilization
Answer the following question given this paragraph: Are there male and female bacteria? Of course the answer is no. So, sexual reproduction does not occur in bacteria. But not all new bacteria are clones. This is because bacteria can acquire new DNA. This process occurs in three different ways:. Q: Do bacteria sexually reproduce? Choices: - sometimes - yes - they don't reproduce - no A:
no
Q: Answer the following question given this paragraph: molecular masses. Primary amines tend to have boiling points intermediate between those of the corresponding alcohol and alkane. Moreover, secondary and tertiary amines have lower boiling points than primary amines of comparable molecular mass. Tertiary amines form cations analogous to the ammonium ion (NH 4+), in which all four H atoms are replaced by alkyl groups. Such substances, calledquaternary ammonium salts, can be chiral if all four substituents are different. (Amines with three different substituents are also chiral because the lone pair of electrons represents a fourth substituent. ) Alkylamines can be prepared by nucleophilic substitution reactions of alkyl halides with ammonia or other amines: Equation 24.12. Q: Which reaction between alkyl halides and ammonia makes alkylamines? Choices: - nitrogen catabolism - conductive substitution reactions - nucleophobic reactions - nucleophilic substitution reactions A:
A: nucleophilic substitution reactions
Question: Answer the following question given this paragraph: A snowflake is made of ice, or water in the solid state. A solid is one of four well-known states of matter. The other three states are liquid, gas, and plasma. Compared with these other states of matter, solids have particles that are much more tightly packed together. The particles are held rigidly in place by all the other particles around them so they can't slip past one another or move apart. This gives solids a fixed shape and a fixed volume. Q: What state of matter completes the list: solid, liquid, gas? Choices: - energy - ice - power - plasma A:
Answer: plasma
*Question*
Answer the following question given this paragraph: Halide minerals are salts. They form when salt water evaporates. This mineral class includes more than just table salt. Halide minerals may contain the elements fluorine, chlorine, bromine, or iodine. Some halide minerals combine with metal elements. Common table salt is a halide mineral that contains the elements chlorine and sodium. Fluorite is a type of halide that contains fluorine and calcium. Fluorite can be found in many colors. If you shine an ultraviolet light on fluorite, it will glow!. Q: What type of minerals form when salt water evaporates? Choices: - sulfide - carbonate - fermite - halide A:
**Answer**
halide
*Question*
Answer the following question given this paragraph: Did you ever see a meteor shower, like the one in Figure below ? Meteors burn as they fall through the mesosphere. The space rocks experience friction with the gas molecules. The friction makes the meteors get very hot. Many meteors burn up completely in the mesosphere. Q: What happens to meteors as they fall through the mesosphere? Choices: - they grow - they bounce - they stop suddenly - they burn A:
**Answer**
they burn