Use the following study to answer the following question(s): A current trend among professional baseball players is to wear braided titanium necklaces. The titanium reportedly regulates the flow of energy through the body. The player wearing the necklace then shows improved strength, tires less, and recovers more quickly.What should one do if the results of an experiment consistently do not support the original hypothesis?
A. Change the hypothesis to match the results.
B. Accept the original hypothesis.
C. Reject the original hypothesis and formulate a new hypothesis.
D. Change the results to match the hypothesis.
Answer: C
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Which of the following statements best characterizes a euphyll?
A. It differs from a lycophyll by having a branched, rather than a single, vascular system. B. It is believed to have evolved from a branch that flattened and developed photosynthetic tissue between the branches. C. It is also called a megaphyll because it is large compared to a lycophyll. D. It evolved separately from the photosynthetic appendages of moss gametophytes. E. All of the choices provided are correct.
You uncovered a fossil that you suspect is around 100 million years old. Which of the radioisotope pairs in the table below could you eliminate as an appropriate choice for radioisotope dating the accompanying rock?
A. Potassium-40/Argon-40 (half-life = 1.3 billion years; useful dating range =100,000-4.5 billion years).
B. Rubidium-87/Strontium-87 (half-life = 47 billion years; useful dating range = 10 million-4.5 billion years).
C. Uranium-235/Lead-207 (half-life = 710 million years; useful dating range = 10 million-4.5 billion years).
D. Carbon-14/Nitrogen-14 (half-life = 5,730 years; useful dating range = 100-50,000 years).
E. Uranium-238/Lead-206 (half-life 4.5 billion years; useful dating range = 10 million-4.5 billion years).
Sperm cells form within a rounded structure called ____ in bryophytes and some other plants
a. antheridium b. stoma c. strobilus d. sporangium e. archegonium
All living organisms can be divided into four nutritional classes based on how they obtain which two resources?
A. nitrogen and carbon B. oxygen and nitrogen C. carbon and energy D. carbon and oxygen