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vodka [1.7K]
3 years ago
7

1 pts

Biology
1 answer:
AlexFokin [52]3 years ago
4 0

Answer:

Messenger RNA (mRNA), molecule in cells that carries codes from the DNA in the nucleus to the sites of protein synthesis in the cytoplasm (the ribosomes).

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The species diversity of an evolutionary lineage will increase when more new member species originate than are lost to extinctio
lesantik [10]

Answer:

A. 2 speciation events and 5 extinctions

B. 5 speciation events and 1 extinction

Explanation:

As we can see from the diagram, there were only 2 ,aim speciation events for lineage A. The extinction events were 5 for the A lineage. Hence, as the extinction event was more rapid than the speciation event so lineage A contains only one species.

On the other hand, the diagram shows that for lineage B there were 5 speciation events and just 1 extinction event. Hence, the number of species in lineage B were more at the time zero as just one extinction had occurred.

5 0
3 years ago
Genetic variation _____.a. is created by the direct action of natural selectionb. must be present in a population before natural
Julli [10]

Answer:

The correct answer is b. must be present in a population before natural selection can act upon the population

Explanation:

Genetic variation can be caused by mutation, recombination between chromosomes during meiosis and by fusion of two genetically different gametes during sexual reproduction.

This genetic variation is necessary for the evolution of any population. Natural selection acts on every individual and it decreases the frequency of those alleles that are not suited for the environment and increase the frequency of those alleles which helps the individual to survive in the changing environment.

Therefore genetic variation must be present in the population before natural selection act on the.

5 0
3 years ago
Woese a. was involved in determining rRNA sequences AND proposed breaking eukaryotes into domains Archaea and Bacteria. b. propo
katrin2010 [14]

Answer:

Option (e).

Explanation:

Karl Woese was an biophysicist and microbiologist. He was known as the originator of rRNA sequences in 1967.

Karl determines the 16rRNA sequence by the technique pioneered by Woese. He breaks the prokaryotes into two groups and discovered the third domain of life.

Thus, the correct answer is option (e).

3 0
3 years ago
When we say that a galaxy is 5000 light years from earth we are actually describing
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<span>A light year refers to a very big amount of distance and is a measurement termed as an astronomical unit of measure. When you say that a galaxy is 5,000 light years away we are actually describing the speed of light within a year. One light year is actually equivalent to 9, 500, 000, 000, 000 kilometers. Just imagine how big or how far that galaxy is when you multiply those kilometers by 5,000?</span>
5 0
3 years ago
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Which forearm bone(s) contribute(s) most heavily to the elbow joint? the humerus the carpal bones the ulna the radius?
kari74 [83]
The bone is ulna. The ulna is a long bone found in the forearm that stretches from the elbow to the smallest finger, and when in anatomical position, is found on the medial side of the forearm. It runs parallel to the radius, the other long bone in the forearm, and is the larger and longer of the two. The radius or radial bone is one of the two large bones of the forearm, the other being the ulna. It extends from the lateral side of the elbow to the thumb side of the wrist and runs parallel to the ulna. The radius is shorter and smaller than the ulna.
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