Doug plants a few peas. after two days, he sees the shoot and the root forming. he observes that the shoot grows upward, toward the light. the root grows downward, into the soil. why do these embryonic organs grow in a specific direction?

the shoot is positively phototropic and positively gravitropic; the root is positively phototropic and positively gravitropic.
the shoot is positively phototropic and negatively gravitropic; the root is positively gravitropic and negatively phototropic.
the shoot is positively gravitropic and negatively phototropic; the root is positively phototropic and negatively gravitropic.

Which of the following claims does the author support the least

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.

How can active reading strategies you? o a. they can you get into better physical shape. o b. they can you read fewer science articles. o c. they can you understand what you read. o d. they can you avoid reading altogether.