Which of the following descriptions tells you something about a population's density? a. the trees are home to many living thingsb. trees grow to a height where they canreach sunlightc. a forest has one hundred trees in onesquare kilometerd. the trees shed their leaves every fall

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

The chromosomal structure that limits the number of cell divisions of a cell is the the chromosomal structure that limits the number of cell divisions of a cell is the kinetochore telomere histones centromere

I’m stuck on this question cuz i’m stupid sksksksk