Q: Activated macrophages and neutrophils discharge what that signals molecules that enhance an immune response? Choices: - alkaloids - pathogens - nucelotides - cytokines A:
cytokines

Q: What type of organisms are helpless at birth and require lots of help from their parents? Choices: - Microorganisms - multicellular organisms - precocial organisms - altricial organisms A:
altricial organisms

Q: Q: Loss of what eventually threatens other species not impacted directly, because of their interconnectedness; as species disappear from an ecosystem others are threatened by changes in available resources? Choices: - technology - oxygen - climate - biodiversity A:
A: biodiversity

Question: Q: What kind of systems use fluid to transmit pressure and increase force? Choices: - plumbing systems - thermal systems - electromagnetic systems - hydraulic systems A:
Answer: hydraulic systems

*Question*
Q: What pathway in a plant do water and nutrients travel through from the roots to the leaves? Choices: - bark - flowers - skin - stem A:
**Answer**
stem

(Q).
Q: The brain and spinal cord are part of what system, which serves as a control center? Choices: - primary nervous system - active nervous system - large nervous system - central nervous system A:
(A).
central nervous system