Answer the following question given this paragraph: The orbits of the planets are elliptical. Q: What shape is the orbit of a planet? Choices: - cleaved - vertical - spiral - elliptical A:
elliptical
(Question)
Answer the following question given this paragraph: The name silicon dioxide implies one silicon atom and two oxygen atoms, so the formula is SiO2. We have a name that has numerical prefixes on both elements. Tri- means three, and tetrameans four, so the formula of this compound is Si3N4. Q: How many atoms of oxygen does silicon dioxide contain? Choices: - three - six - one - two A:
(Answer)
two
Ques: Answer the following question given this paragraph: Bernoulli's law states that the pressure of a moving fluid such as air is less when the fluid is moving faster. Pressure is the amount of force applied per given area. The law is named for Daniel Bernoulli, a Swiss mathematician who discovered it during the 1700s. Bernoulli used mathematics to arrive at his law. For an animation of the law, go to the URL below. Q: The amount of force applied per given area is called? Choices: - energy - strength - power - pressure A:
Ans: pressure
(Q).
Answer the following question given this paragraph: Classification and Phylogeny Scientists use a tool called a phylogenetic tree to show the evolutionary pathways and relationships between organisms. A phylogenetic tree is a diagram used to reflect evolutionary relationships among organisms or groups of organisms. The hierarchical classification of groups nested within more inclusive groups is reflected in diagrams. Scientists consider phylogenetic trees to be a hypothesis of the evolutionary past because one cannot go back through time to confirm the proposed relationships. Unlike with a taxonomic classification, a phylogenetic tree can be read like a map of evolutionary history, as shown in Figure 12.4. Shared characteristics are used to construct phylogenetic trees. The point where a split occurs in a tree, called a branch point, represents where a single lineage evolved into distinct new ones. Many phylogenetic trees have a single branch point at the base representing a common ancestor of all the branches in the tree. Scientists call such trees rooted, which means there is a single ancestral taxon at the base of a phylogenetic tree to which all organisms represented in the diagram descend from. When two lineages stem from the same branch point, they are called sister taxa, for example the two species of orangutans. A branch point with more than two groups illustrates a situation for which scientists have not definitively determined relationships. An example is illustrated by the three branches leading to the gorilla subspecies; their exact relationships are not yet understood. It is important to note that sister taxa share an ancestor, which does not mean that one taxon evolved from the other. The branch point, or split, represents a common ancestor that existed in the past, but that no longer exists. Humans did not evolve from chimpanzees (nor did chimpanzees evolve from humans) although they are our closest living relatives. Both humans and chimpanzees evolved from a common ancestor that lived, scientists believe, six million years ago and looked... Q: What diagram is used to reflect evolutionary relationships among organisms or groups of organisms? Choices: - relationships tree - conceptual tree - biodiversity tree - phylogenetic tree A:
(A).
phylogenetic tree
Ques:Answer the following question given this paragraph: In a Down's cell, the liquid sodium ions are reduced at the cathode to liquid sodium metal. At the anode, liquid chloride ions are oxidized to chlorine gas. The reactions and cell potentials are shown below. Q: At the anode, liquid chloride ions are oxidized to what? Choices: - elemental gas - nitrogen gas - Heavy Gas - chlorine gas A:

Ans:chlorine gas
Answer the following question given this paragraph: The Permian Period ended with Earth's second mass extinction. During this event, most of Earth's species went extinct. It was the most massive extinction ever recorded. It's not clear why it happened. One possible reason is that a very large meteorite struck Earth. Another possibility is the eruption of enormous volcanoes. Either event could create a huge amount of dust. The dust might block out sunlight for months. This would cool the planet and prevent photosynthesis. Q: What happened to earth's species during the permian period? Choices: - evolution - duplication - division - mass extinction A:
mass extinction