Lichens that colonize bare rocks are an example of a pioneer species. In which environment would a pioneer species of lichen
be most successful?

Select one:
A:a grassland that has established itself on the site of an old farm

B:an old growth deciduous forest

C:a hillside that has been cleared by a volcanic eruption

D:a mountain meadow after a thunderstorm

C. A hillside that has been cleared by a volcanic eruption.

Explanation:

Pioneer species are hardy species which are the first to colonize barren environments or previously biodiverse steady-state ecosystems that have been disrupted, such as by fire or other natural disasters. Some lichens grow on rocks without soil, so may be among the first of life forms, and break down the rocks into soil for plants.

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the index of refraction of the second medium is higher. i just took the test trust me !

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.