Answer the following question given this paragraph: 29.3 Amphibians As tetrapods, most amphibians are characterized by four well-developed limbs, although some species of salamanders and all caecilians are limbless. The most important characteristic of extant amphibians is a moist, permeable skin used for cutaneous respiration. The fossil record provides evidence of amphibian species, now extinct, that arose over 400 million years ago as the first tetrapods. Amphibia can be divided into three clades: salamanders (Urodela), frogs (Anura), and caecilians (Apoda). The life cycle of frogs, like the majority of amphibians, consists of two distinct stages: the larval stage and metamorphosis to an adult stage. Some species in all orders bypass a free-living larval stage. Q: The most important characteristic of extant amphibians is a moist, permeable skin used for this? Choices: - benign respiration - simple respiration - avian respiration - cutaneous respiration A:
cutaneous respiration
(Question)
Answer the following question given this paragraph: Recall that a double bond consists of one sigma bond and one pi bond. In order for a double bond to be formed, each participating carbon atom must have at least one unhybridized p orbital. In a carbon-carbon double bond where both carbons are bonded to two additional atoms, each carbon is sp 2 hybridized. The double bond includes a sigma bond between a hybrid orbital from each carbon and a pi bond between the leftover p orbital from each carbon. The angles between any two bonds for an sp 2 hybridized carbon are approximately 120. Q: What kind of bond consists of one sigma bond and one pi bond? Choices: - beta bond - covalent bond - ionic bond - double bond A:
(Answer)
double bond
Ques: Answer the following question given this paragraph: Q: What is stored and concentrated in the gallbladder? Choices: - calcium - oxygen - insulin - bile A:
Ans: bile
(Q).
Answer the following question given this paragraph: Homologous structures are structures that have a common function and suggest common ancestry. For example, homologous structures include the limbs of mammals, such as bats, lions, whales, and humans, which all have a common ancestor. Different mammals may use their limbs for walking, running, swimming or flying. The method the mammal uses to move is considered a common function. Q: What are structures that have a common function and suggest common ancestry? Choices: - reversible structures - analogous structures - monogamous structures - homologous structures A:
(A).
homologous structures
Ques:Answer the following question given this paragraph: A third difference between plant and animal cells is that plants have several kinds of organelles called plastids . And there are several different kinds of plastids in plant cells. For example, Chloroplasts are needed for photosynthesis, leucoplasts can store starch or oil, and brightly colored chromoplasts give some flowers and fruits their yellow, orange, or red color. It is the presence of chloroplasts and the ability to photosynthesize, that is one of the defining features of a plant. No animal or fungi can photosynthesize, and only some protists are able to. The photosynthetic protists are the plant-like protists, represented mainly by the unicellular algae. Q: Chloroplasts, leucoplasts and chromoplasts are found in what type of cells? Choices: - nitrogen cells - animal cells - man-made cells - plant cells A:

Ans:plant cells
Ques: Answer the following question given this paragraph: The pressure of ocean water increases rapidly as the water gets deeper. Q: What property of ocean water increases rapidly as the water gets deeper? Choices: - visability - speed - salt content - pressure A:
Ans:
pressure