What event starts an action? a: habit b: trial and error c: response d: reflex e: stimulus i have more questions that i will put in comments.

Which statement is true about the cell theory? a) it is well-supported by evidence. b) it is unchangeable and permanent.

How and why organisms are hierarchically classifies

Which of the following correctly matches an immune system cell with the defense it produces? a. b cells release cytotoxins. b. t cells release cytotoxins. c. b cells absorb antibodies. d. t cells absorb antibodies.