1. Boiling water and producing water vapor II. Freezing liquid water into ice cubes
III. Mixing salt into a beaker of water until the salt dissolves
IV. Combining hydrogen gas and oxygen gas in a way to make liquid water
When a chemical change occurs something new is formed. The reactants have different properties than the products. The
product cannot easily be separated into its original parts.
of the four examples listed above, which describe a chemical change?
A)
B)
IV
III
C
D)
II.

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !

ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.