Answer:
A main cause of speciation is when species become geographically isolated.
Explanation:
Speciation refers to a process in which a population turns into a different species. One of the main causes of this is geographic isolation because when a population is separated because of a barrier like a river, this population adjusts to the specific environment and it becomes different from another population that can't breed with the members of this population.
would happen if the rough endoplasmic reticulum in the cell of an organism lost all
of its ribosomes?
A. ATP production in the cell would stop.
B. Protein production in the organism would stop.
C. Storage of proteins within the cell would increase.
D. Proteins would no longer be exported from the cell.
Answer: B. Protein production in the organism would stop.
Explanation: Ribosomes are organelles involved with synthesis of proteins. There are about 10 million ribosomes in a single cell. Therefore, absence of ribosomes would result lack of protein production by the cells or ER.