Q: Because dizygotic twins develop from two eggs fertilized by two sperm, they are no more identical than siblings born at what? Read this paragraph and choose the correct option from the provided answers: birth of dizygotic (or fraternal) twins. Because dizygotic twins develop from two eggs fertilized by two sperm, they are no more identical than siblings born at different times. Much less commonly, a zygote can divide into two separate offspring during early development. This results in the birth of monozygotic (or identical) twins. Although the zygote can split as early as the two-cell stage, splitting occurs most commonly during the early blastocyst stage, with roughly 70100 cells present. These two scenarios are distinct from each other, in that the twin embryos that separated at the two-cell stage will have individual placentas, whereas twin embryos that form from separation at the blastocyst stage will share a placenta and a chorionic cavity. Choices: - other times of day - different places - other eras - different times A:
different times

Q: What do you call compounds that have covalent bonds? Read this paragraph and choose the correct option from the provided answers: Covalent bonds are bonds in which atoms share rather than transfer electrons. Compounds with covalent bonds are called covalent compounds. Choices: - reflectivity compounds - valence compound - ions - covalent compounds A:
covalent compounds

Q: The fundamental unit of time, the second, is based on what type of clock? Read this paragraph and choose the correct option from the provided answers: Figure 1.18 An atomic clock such as this one uses the vibrations of cesium atoms to keep time to a precision of better than a microsecond per year. The fundamental unit of time, the second, is based on such clocks. This image is looking down from the top of an atomic fountain nearly 30 feet tall! (credit: Steve Jurvetson/Flickr). Choices: - quantum clock - eternal clock - gravity clock - atomic clock A:
atomic clock

Q: The cerebellum is associated with what major human organ? Read this paragraph and choose the correct option from the provided answers: Figure 13.13 The Cerebellum The cerebellum is situated on the posterior surface of the brain stem. Descending input from the cerebellum enters through the large white matter structure of the pons. Ascending input from the periphery and spinal cord enters through the fibers of the inferior olive. Output goes to the midbrain, which sends a descending signal to the spinal cord. Choices: - bladder - liver - heart - brain A:
brain