Paxton was working on a poster of the sea-flooring spreading process. He began with mid-ocean ridges and ended with ocean trenches. Which best describes the order of the ages of the rock on his poster?
The poster begins with the youngest rock and ends with the oldest
The poster shows different stages of rock whose relative age can't be determined
All the rock stages shown on the poster are the same age
The poster begins with the oldest rock and ends with the youngest rock

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.

Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.