Answer the following question given this paragraph: Phylogenetic Trees Scientists use a tool called a phylogenetic tree to show the evolutionary pathways and connections among organisms. A phylogenetic tree is a diagram used to reflect evolutionary relationships among organisms or groups of organisms. Scientists consider phylogenetic trees to be a hypothesis of the evolutionary past since one cannot go back to confirm the proposed relationships. In other words, a "tree of life" can be constructed to illustrate when different organisms evolved and to show the relationships among different organisms (Figure 20.2). Unlike a taxonomic classification diagram, a phylogenetic tree can be read like a map of evolutionary history. Many phylogenetic trees have a single lineage at the base representing a common ancestor. Scientists call such trees rooted, which means there is a single ancestral lineage (typically drawn from the bottom or left) to which all organisms represented in the diagram relate. Notice in the rooted phylogenetic tree that the three domains Bacteria, Archaea, and Eukaryadiverge from a single point and branch off. The small branch that plants and animals (including humans) occupy in this diagram shows how recent and miniscule these groups are compared with other organisms. Unrooted trees don't show a common ancestor but do show relationships among species. Q: What tool do scientist's use to show the evolutionary pathways and connections among organisms? Choices: - conceptual tree - superficial tree - photogenetic tree - phylogenetic tree A:
phylogenetic tree
(Question)
Answer the following question given this paragraph: Cancer can also be found in children. But childhood cancer is rare. Leukemia is the main type of cancer in children. It makes up about one third of all childhood cancers. It happens when the body makes abnormal white blood cells. Q: Production of abnormal white blood cells occurs in what cancer, which is the most common form in children? Choices: - Brain - Breast - Bone - leukemia A:
(Answer)
leukemia
Ques: Answer the following question given this paragraph: Q: While enzymatic hydrolysis proceeds, peristalsis moves the mixture of chyme and digestive juices along what? Choices: - esophagus - stomach - large intestine - small intestine A:
Ans: small intestine
(Q).
Answer the following question given this paragraph: Reactions can proceed by themselves if they are exergonic or exothermic, that is if they release energy. The associated free energy of the reaction is composed of two different thermodynamic quantities, enthalpy and entropy. Enthalpy is a measure of the total energy of a thermodynamic system. The change in enthalpy is positive in endothermic reactions, and negative in exothermic processes. Q: Enthalpy is a measure of the total energy of what kind of system? Choices: - macroscopic - planetary - hypodermic - thermodynamic A:
(A).
thermodynamic
Ques:Answer the following question given this paragraph: Group 16 is called the oxygen group. The first three elements in this group are nonmetals. They are followed by one metalloid and one metal. All the elements in the oxygen group have six valence electrons, and all are reactive. Oxygen (O), for example, readily reacts with metals to form compounds such as rust. Oxygen is a gas at room temperature. The other four elements in group 16 are solids. Q: Group 16 is called what? Choices: - noble gases - the acid group - metalloids - the oxygen group A:

Ans:the oxygen group
Question: Answer the following question given this paragraph: The Bohr model postulates that electrons orbit the nucleus at fixed energy levels. Q: What model postulates that electrons orbit the nucleus at fixed energy levels? Choices: - Newton's model - coreolis - atomic model - bohr A:
Answer:
bohr