Answer the following question given this paragraph: A rate is a measure of how some property varies with time. Speed is a familiar rate that expresses the distance traveled by an object in a given amount of time. Wage is a rate that represents the amount of money earned by a person working for a given amount of time. Likewise, the rate of a chemical reaction is a measure of how much reactant is consumed, or how much product is produced, by the reaction in a given amount of time. The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure. For reactions involving one or more colored substances, rates may be monitored via measurements of light absorption. For reactions involving aqueous electrolytes, rates may be measured via changes in a solution's conductivity. For reactants and products in solution, their relative amounts (concentrations) are conveniently used for purposes of expressing reaction rates. If we measure the concentration of hydrogen peroxide, H2O2, in an aqueous solution, we find that it changes slowly over time as the H2O2 decomposes, according to the equation: 2H 2 O 2(aq) 2H 2 O(l) + O 2(g) The rate at which the hydrogen peroxide decomposes can be expressed in terms of the rate of change of its concentration, as shown here: change in concentration of reactant time interval H 2 O 2 t H 2 O 2 t 1 2 = t2 t1. Q: What kind of variation does a rate measure? Choices: - environment to time - value to time - construction to time - property to time A:
property to time
(Question)
Answer the following question given this paragraph: Cell Structure The cells of protists are among the most elaborate of all cells. Most protists are microscopic and unicellular, but some true multicellular forms exist. A few protists live as colonies that behave in some ways as a group of free-living cells and in other ways as a multicellular organism. Still other protists are composed of enormous, multinucleate, single cells that look like amorphous blobs of slime, or in other cases, like ferns. In fact, many protist cells are multinucleated; in some species, the nuclei are different sizes and have distinct roles in protist cell function. Single protist cells range in size from less than a micrometer to three meters in length to hectares. Protist cells may be enveloped by animal-like cell membranes or plant-like cell walls. Others are encased in glassy silica-based shells or wound with pellicles of interlocking protein strips. The pellicle functions like a flexible coat of armor, preventing the protist from being torn or pierced without compromising its range of motion. Q: What functions like a flexible coat of armor, preventing the protist from being torn or pierced without compromising its range of motion? Choices: - fimbriae - biofilm - endothelium - pellicle A:
(Answer)
pellicle
Ques: Answer the following question given this paragraph: Lancelets are invertebrate chordates that retain all four defining chordate traits as adults. There are only about 25 species of living lancelets. Lancelets resemble tunicates in several ways. For example:. Q: What are invertebrate chordates that retain all four defining chordate traits as adults called? Choices: - vertebrates - sporozoans - tunicates - lancelets A:
Ans: lancelets
(Q).
Answer the following question given this paragraph: The most common way of classifying stars is by color as shown, in Table below . Each class of star is given a letter, a color, and a range of temperatures. The letters don't match the color names because stars were first grouped as A through O. It wasn't until later that their order was corrected to go by increasing temperature. When you try to remember the order, you can use this phrase: "Oh Be A Fine Good Kid, Man. ". Q: What is the most common way to classify stars? Choices: - by age - by distance - by size - by color A:
(A).
by color
Ques:Answer the following question given this paragraph: The haploid gametophyte produces the gametes, or sperm and egg, by mitosis. Remember, gametes are haploid, having one set of chromosomes. Q: By what process does the haploid gametophyte produce the gametes? Choices: - meiosis - angiogenesis - Spermatogenesis - mitosis A:

Ans:mitosis
Ques:Answer the following question given this paragraph: Mollusks are divided into ten living classes, including the familiar gastropods, cephalopods, and bivalves. Q: Gastropods, cephalopods, and bivalves are examples of what class? Choices: - animals - invertebrates - cetaceans - mollusks A:

Ans:
mollusks