How do the elephants help to maintain the population of birds that you can see perched on their backs in the picture
above?
The elephants supply a place for the birds to nest and reproduce.
The elephants supply a much needed food source by allowing the birds to
eat bugs off their backs.
The elephants provide diversity in ecosystems by carrying the birds long
distances as they travel in herds.
The elephants provide a fresh water supply by carrying the birds back and
forth from their local watering hole.

Coquina, a type of limestone, forms from shell fragments that settle on the ocean floor. what type of rock is coquina?

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.

Which represents the cross between parent plants if one is heterozygous for yellow-colored pods and the other is homozygous for green-colored pods? yy  ´    ´    ´    ´  yy