Question 4 of 10
2 Points
An extreme disturbance happens in an ecosystem. How does an ecosystem
change as succession happens after this disturbance?
O
A. The population of most species decreases.
O
B. Biodiversity in the ecosystem increases.
O
C. There is less biodiversity in the ecosystem.
O D. The ecosystem has more keystone species.

List charasteristics of athenosphere

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.

Vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen