Why are fossils older than 60 000 years hard to date using C14? What will be an ideal response?
ANSWER: C14 has a half-life of just over 5000 years. With each half-life, half of the C14 present goes
through radioactive decay. By 60 000 years, the vast majority of the C14 is gone due to so
many successive half-lives. While theoretically some C14 remains, the amount would be
insufficient to accurately date the fossil.
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Which of the following is thought to be the descendant of ancient bacteria?
a. nuclei b. Golgi bodies c. ER d. mitochondria
e. lysosomesWhat kingdoms composed the three kingdom classification system used by scientists in the late 1800s?
a. animals, plants, fungi b. animals, plants, bacteria c. animals, fungi, protists d. animals, plants, protists
A nucleotide is made of a
A) phosphate, sugar, and nitrogenous base. B) phospholipid, sugar, and protein. C) phosphate, protein, and nitrogenous base. D) phospholipid, sugar, and nitrogenous base.
The figure above represents the findings of an observation study that examined the selection pressure of pre-dation on group size and behavior in guppies. Interpret the graphs and explain the results
What will be an ideal response?