You walk outside and find your dad installing a wall of large rocks halfway down your sloping backyard. Before your dad began
building the wall, parts of your backyard looked like the picture above. Which choice is the best explanation for why your dad wants
to install this wall of rocks?
A)
He is a rock collector and thinks they will look nice in the back yard.
B)
He wants to divide the yard into two equally sized areas for gardening,
The rocks make it easier to walk up and down the sloping back yard.
D)
The rocks will keep the soil from washing down the sloping back yard.
Earth's Systems

Differences between compact bone and cartilage

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.

Waianapanapa beach in hawaii is a black-sand beach that was formed by waves crashing against volcanic rock. the sand can be very hot on sunny days. which statement best explains why? o a. the black sand has no heat capacity. b. the black sand absorbs no radiation. o c. the black sand is immune to insolation. d. the black sand has a low albedo.