Which of the following statements about comets is true?
A. Comets are mostly made up of dust particles, frozen water and frozen gases. They are usually very easy to see but as
they approach the Sun, these particles condense and become much harder to see
B. Comets are mostly made up of rock. They are usually very easy to see but as they approach the Sun, the rock condenses
and becomes much harder to see.
C. Comets are mostly made up of rock. They are usually very hard to see, but as they approach the Sun, the rock heats up
and becomes much easier to see.
D. Comets are mostly made up of dust particles, frozen water and frozen gases. They are usually very hard to see, but as
they approach the Sun, these particles heat up and become much easier to see.

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

Which of the following types of rock would most likely contain a fossil? slate granite lava rock limestone

Taq polymerase is an enzyme isolated from the organism thermophilus aquaticus. this organism has been found living in the hot springs of yellowstone national park. this enzyme is used to copy human dna from crime scenes. most reactions are performed at ranges similar to those of the human body; however, what considerations should be made for optimum use of this enzyme? view available hint(s)taq polymerase is an enzyme isolated from the organism thermophilus aquaticus. this organism has been found living in the hot springs of yellowstone national park. this enzyme is used to copy human dna from crime scenes. most reactions are performed at ranges similar to those of the human body; however, what considerations should be made for optimum use of this enzyme? the enzyme will not work on human dna.nothing should be altered.the ph should be decreased.the temperature should be raised.