B. oceans
C. rivers
D. deserts
Rivers are the geographic feature that gave rise to early civilization. The earliest urban foundations were made someplace in the scope of 4000 and 3000 B.C.E. when the rising of agribusiness and trade allowed people to have surplus food and financial security.
Since many people no longer needed to farm for food, a wide range of occupations and interests could flourish in a small area. Mesopotamia, Egypt, the Indus Valley, and China are the four oldest civilizations because they provided the foundation for ongoing cultural development.
Learn more about early civilization, here:
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Answer:
The options to this question are missing, they are:
A) All the proteins the cell creates from the miscopied strand will do different jobs than the old ones.
B) Any miscopied DNA will be replaced with an accurate DNA copy once the cell divides.
C) Both new DNA strands will end up together in a new cell, and the inaccurate one will be discarded.
D) If the new sequence codes for the same amino acid as the original cell, it will function normally.
THE CORRECT ANSWER IS D
Explanation:
What occured to this cell replicating its DNA is called MUTATION, which is a change (small or big) in the nucleotide sequence of a DNA. The miscopied base will alter the nucleotide sequence of the DNA. Since a single base is involved, it is referred to as a POINT MUTATION.
A point mutation, such as the one in this case, can produce varying effects in the resulting organism. The mutation can either lead to a different protein in that particular sequence the mutation occured or have no effect on the organism.
The mutation will have no effect on the organism in a case where the base that was miscopied produced a codon that codes for the same amino acid as the original codon. Hence, the same protein will be produced and have both effect on the cell. This is possible because of the degenerate nature of the genetic code, as more than one codon codes for a given amino acid.
Porifera: sponges
Cnidaria: stingers
Mollusca: mollusks
Arthropoda: arthropods
Echinodermata: echinoderms
b. volcanic
a. rift
The Triassic Period indicated the commencement of significant developments that were to take place everywhere in the Mesozoic Era, individually in the administration of regions, the development of life, and the geographic concentration of living things.
At the conclusion of the Triassic, the supercontinent of Pangea, which consolidated all of the modern regions into a single landmass, started to split (rift) apart. As North America segregated from Africa and the Atlantic Ocean started to form, volcanic activity on a comprehensive scale originated carbon dioxide into the environment. This led to global warming and modifications to the oceans that were comparable to those that happened at the end-Permian extirpation.
b. a transmission electron microscope, because it has high resolution
A scanning electron microscope would be the best choice for a scientist examining the living cells lining the respiratory tract. This is due to its capability of scanning the surface of the whole cells, which is essential to properly observe the tiny hairs on these cells that move dirt and mucus away from the lungs.
To explore living cells lining the respiratory tract, the best instrument would likely be a scanning electron microscope (SEM). While both SEM and transmission electron microscopes provide high-resolution images, a key difference is how they interact with the specimen. The SEM scans the surface of whole cells, making it ideal for observing the tiny hairs, or cilia, on the cells of the respiratory tract. These tiny hairs move in coordinated waves, pushing mucus and trapped particles out of our lungs. This process can be best observed on the whole cell surface, which is why SEM would be preferred.
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