Which of the following are classified as blood vessels? Check all that apply. ventricles
arteries
capillaries
lymph nodes
veins

What must happen before meiosis can begin? a. four gametes must be produced b. the four tetrads must be pulled apart c. dna doubles and produces sister chromatids d. the cell membrane pinches together

Which kind of aquatic ecosystem does the photograph most likely show? a. marsh b. swamp c. lake d. river

What are some possible short and long term medical concerns for crew members on longer space exploration trips