An example of a hypothesis that is not a valid scientific hypothesis because it cannot be proven false;
A) the earth is flat
B) the sun revolves around the earth
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C) organisms similar to deep-water marine worms live in the center of the earth
D) the deepest spot on the ocean is off the coast of a volcanic island
E) whales listen to sound

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 component in a graph indicates an independent factor? a. y-axis b. x-axis c. scale

Which example describes a mutualistic relationship between organisms? young wasps prey on caterpillars. crabs eat the remains of dead fish. tapeworms feed on food in the intestines of cats ants protect a tree on which they feed.