The oldest rocks and minerals on earth's surface have been found in canada and australia and are from the:

Biology

1 answer:

Orlov [11]3 years ago

3 0

The time period was called the Hadean Eon, and the rocks themselves are nearly 4.4 billion years old

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The Institutional Review Board Committee's major concerns are protecting human research participants from physical or mental har

Sidana [21]

Answer: a. True

Explanation:

The main aim of the IRB is to safeguard the right of the human subjects used for the purpose of research conducted by the governmental authority. It also emphasizes over the protection of the researchers from illegal complaints. The risks to the human subjects can be minimized by using procedures which cause no harm to them and a detail consent of the research practice should be taken from these subjects by informing the purpose of research.

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3 years ago

Hairpins often form at palindromic sequences in single strands of either rna or dna. however, several key features differentiate

AlekseyPX

Hairpin like structures are formed in both DNA and RNA but are common in RNA than in DNA. This is because DNA can be double stranded or single stranded while RNA is generally single stranded structure that can be double stranded only when it forms a hair pin like structure.
The features of hairpin structure in RNA are as follows:
1. This structure is a building block of many secondary structures of RNA.
2. The termination sequence during transcription also forms a hairpin loop like structure.
3. tRNA also forms a hairpin loop like structure and helps in the process of translation.

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4 years ago

_________________________ are the most reflective substances on the surface of Earth.

solniwko [45]

Answer:

The answer is snow

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2 years ago

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You are studying a population of American robins, Turdus migratorius, in which approximately 2% of all individuals carry a reces

IrinaVladis [17]

Yes, It seems that evolution has occurred in this area.

Explanation:

Evolution refers to a phenomena in which new traits or alleles that favor a better survival of organisms in a given environment, become fixed in the population.

Evolution is characterized by appearance of new characters and change in allele frequencies.

In the given situation we find that the frequency of the recessive allele in the population has changed over time and the percentage has become fixed.

So, we can say that evolution has occurred in the robin population

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3 years ago

Two structures play an important role in the way that birds digest food.

jolli1 [7]

Answer:

Gizzard and crop

Explanation:

I just answered that question.

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3 years ago