<span>A(n)PRIMITIVE CHARACTER is one present in the common ancestor and all members of the group
Primitive character is also known as ancestral character in phylogenetics. It is defined as a characteristic that has undergone little change since time immemorial and is inherited from a common ancestor of a clad.
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In this type of descent group, two individuals cannot actually trace how they are related by blood; rather, they trace their descent to a mythical ancestor.
-Clan
Answer:
Each cell expresses, or turns on, only a fraction of its genes. The rest of the genes are repressed, or turned off. Signals from the environment or from other cells activate proteins called transcription factors. These proteins bind to regulatory regions of a gene and increase or decrease the level of transcription.
Explanation:
Answer:
I feel as though, if pollution isn't stopped, then there will be tons of oil and trash.
Over 14 <em>billion</em> pounds of plastic trash is thrown into oceans each year.
Scientists have come to believe that the ocean will have 937 million tons of plastic and only 895 million tons of fish by 2050. The plastic just might outweigh the fish! Some scientists also believe that in around 4 billion years, the ocean might become obsolete due to global warming causing higher evaporation.
4.9 million liters of oil is spilled into the ocean each year, the ocean might turn brown, fish and ocean animals could all go extinct.
Answer:
A
Explanation:
Constructing passage ways near the dams to allow to salmon to swim around blocked rivers. The construction of dams in rivers has blocked the path of some salmons returning to spawning grounds. The best way to overcome this is to make the passage ways near the dams to allow salmons to swim in areas which have blocked due to dams. So that salmons can returned to the spawning ground and can spawn which leads to increase in their population.