Ans.
The given diagram represents a cladogram, which is used to show evolutionary relationships between various organisms or species.
The intersection points between the lines show the common ancestors, which evolved into different organisms at the end of the branches, as A, B, C, D.
The first branch end (A) represents that most primitive organism, while the last branch end (D) represents the most recent organism.
Thus, the correct answer is option). 'organism A is the most primitive organism.'
Embryonic stem cells can be grown relatively easily in culture. Adult stem cells are rare in mature tissues, so isolating these cells from an adult tissue is challenging, and methods to expand their numbers in cell culture<span> have not yet been worked out. This is an important distinction, as large numbers of cells are needed for stem cell replacement therapies.</span>
C,when an animal adapts it changes itself or its behavior for the better of survival.
Answer:
They have a negative charge since they are represented by a minus sign.
