Answer:
C. Gene trees are only useful studying the relationships of sequences from different species.
Explanation:
Gene tree traces the evolutionary history of a particular gene. It includes all the events like duplication and speciation. It helps to study the relationship of genes from different species. Often these are orthologous genes which came form the same ancestor and code for the same protein indifferent species. Gene tree also helps to study the relationship of genes in the same species. Often these are paralogous genes which evolved by duplication and code for similar but not identical proteins in the same species. Hence, the statement that gene trees are only useful for studying the relationships of sequences from different species is incorrect.
Answer:
C
Explanation:
There are different types of T-Cells, aka Lymphocytes.
the Cytotoxic T-Cells will find and directly attack, also giving them the name "Killer Cells"
The Cytotoxic cell's main purpose is to find bacteria, viruses, and cancer cells.
Next,
there is the Helper T Cells, which recruit other immune system cells and organize a special immune response.
Regulatory T cells, suppress the immune system so it doesn't overreact. Just as in Auto-Immune diseases
Sexual reproduction is a process involving the fusion of two gametes to form a zygote. Gametes are special reproductive cells produced by meiosis. It produces genetically dissimilar offspring. Offspring may inherit beneficial qualities from both parents and there is a greater genetic variation in the offspring, leading to species that are better adapted to changes in the environment.
The best explanation Charles Darwin provided was C) <span> He was the first to provide an explanation of evolution supported by evidence. </span>
