Answer the following question given this paragraph: Stems hold plants upright, bear leaves and other structures, and transport fluids between roots and leaves. Q: What basic structure holds plants upright, bears leaves and other structures, and transports fluids between roots and leaves? Choices: - branches - flowers - leaves - stem A:
stem
Answer the following question given this paragraph: Solution: The force acting to move the system is the weight of box B, and the force resisting the movement is the force of friction between the table and box A. The mass of the system is the sum of the masses of both boxes. The acceleration of the system can be found by dividing the net force by the total mass. Q: Dividing net force by total mass yields what? Choices: - energy - transmission - movement - acceleration A:
acceleration
Q: Answer the following question given this paragraph: Q: Vertebrates lacking what structures often use lungs for gas exchange? Choices: - pores - nostrils - spores - gills A:
A: gills
Question: Answer the following question given this paragraph: Most STIs are caused by bacteria or viruses. Several of them are described below. Bacterial STIs can be cured with antibiotics. Viral STIs cannot be cured. Once you are infected with a viral STI, you are likely to be infected for life. Q: What can bacterial stis be cured with? Choices: - antioxidants - pesticides - antiviral drugs - antibiotics A:
Answer: antibiotics
*Question*
Answer the following question given this paragraph: After implantation occurs, the blastocyst is called an embryo . The embryonic stage lasts through the eighth week following fertilization. During this time, the embryo grows in size and becomes more complex. It develops specialized cells and tissues and starts to form most organs. For an interactive animation of embryonic development, go to this link: http://health. howstuffworks. com/adam-200129. htm . Q: What is the blastocyst called after implantation? Choices: - trophoblast - an nucleus - an produce - an embryo A:
**Answer**
an embryo
*Question*
Answer the following question given this paragraph: The highest-numbered shell is the third shell, which has 2 electrons in the 3s subshell and 3 electrons in the 3p subshell. That gives a total of 5 electrons, so neutral phosphorus atoms have 5 valence electrons. The 10 remaining electrons, from the first and second shells, are core electrons. Q: How many valence electrons do neutral phosphorus atoms have? Choices: - nine - three - four - five A:
**Answer**
five