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Zolol [24]
3 years ago
5

Which of these is a pure substance? a. diamond b. salt c. ocean water a only a, b, and c a and b b and c

Biology
1 answer:
Sloan [31]3 years ago
6 0

The answer is a. and b.

Diamond is pure carbon(C). Salt is pure sodium chloride (NaCl). Ocean water can contain a number of different elements mostly Water (H2O) and sodium (Na)

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Define the following words:
Shtirlitz [24]
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Aquaculture, or aquafarming, has to do with farming of fish, <span>crustaceans, molluscs, aquatic plants, algae, and other aquatic organisms.
2. Recreation has to do with spending leisure time, be it in zoos, aquariums, etc.
3. Biological control has to do with </span><span> controlling pests such as insects, mites, weeds and plant diseases using other organisms, such as parasitoids and pathogens.
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6 0
2 years ago
How would you account for the fact that fossils of fish are not present in the older layers of rock?
Mademuasel [1]

Answer:

The fish did not yet exist when the old layers of rocks were deposited. In fact, animals with hard parts did not evolve until about 600 million years ago, which is only about 13% of the 4.5 billion year age of the Earth. Multicellular animals without hard parts left tracks in older sediments, but had no fossilize-able body parts.

Explanation:

5 0
3 years ago
How many atomos there are in 5.2g of mercury
Vitek1552 [10]
2.34A
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8 0
2 years ago
Crude oil is turned into usable forms of energy in a ______.
iren [92.7K]

Answer: C) Turbine

Explanation: Crude oil is turned into usable forms of energey by a Combustion Turbine. Hope this helped!  

5 0
2 years ago
Koch's postulates are used to establish the infectious agent that causes a particular infectious disease. In 1937, Thomas Rivers
Sedbober [7]

Answer:

B. The pathogen must be grown in pure culture.

Explanation:

Virus, and also some bacteria can not be cultured in "lifeless media". In the case of bacteria, we refer to the obligate intracellular ones, and all virus. Thus, this postulate can not be fulfilled in all cases. Virus can be propagated on tissue cultures, but certainly this was not considered by Koch. Moreover, these methods often result in spontaneous genetic alterations, which leads to adaptation and even attenuation in animal models of disease, so, the cultured virus perhaps does not induce the same disease when introduced to another specimen.

7 0
3 years ago
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