Why do scientists favor the clade in which derived traits evolve the fewest times? What will be an ideal response?
ANSWER: The evolution of a trait is a rare event, based on selective pressure and luck. The odds of a
given event happening repeatedly are far less than it happening one time. As a result,
minimizing the number of times derived traits are required to have evolved increases the
likelihood of the clade.
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Discuss the advantages of a closed circulatory system, compared to an open circulatory system
What will be an ideal response?
Answer the following statements true (T) or false (F)
1.The right ventricle sends blood to the systemic circulation. 2.While arteries are usually full of oxygenated blood, the one major exception is the pulmonary artery. 3.In an open circulatory system, the heart pumps fluid through open-ended vessels into spaces where the fluid bathes the body's cells. 4.If you compared the blood pressure of an insect to that of a mammal, you would expect the pressure to be lower in the insect. 5.The pulmonary vein transports deoxygenated blood from the lungs to the heart.
In moss, _____ produce sperm.
a) protonemata b) antheridia c) archegonia d) embryos e) sporangia
In research on aging (both cellular aging and organismal aging), it has been found that aged cells do not progress through the cell cycle as they had previously
Which of the following, if found in cells or organisms as they age, would provide evidence that this is related to cell signaling? A) Growth factor ligands do not bind as efficiently to receptors. B) Hormone concentrations decrease. C) cAMP levels change very frequently. D) Enzymatic activity declines.