From the list provided below, choose those observations that accurately describe the mineral presented in this image.
A. This mineral effervesces with dilute HCl without being pulverized into a fine powder.
B. This mineral displays two directions of cleavage.
C. This mineral flakes into thin sheets.
Answer: A
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Which statement about microorganisms is true?
A. Bacteria and other microbes help purify the water we drink. B. The majority of bacteria and fungi are toxic to humans. C. Bacteria destroy more energy than they produce. D. The "bacterial zoo" in our digestive systems has no known function. E. The use of microorganisms to control plant diseases has not worked well.
Which of the following statements about the structure of benzene is true?
A) All the C-C bonds in benzene are longer than a typical C=C. B) All the C-H bonds in benzene are longer than a typical C-H bond. C) The benzene molecule contains alternating double and single bonds. D) Benzene is a 1:1 mixture of two equilibrating structures.
What is the normal lapse rate in the troposphere?
A. 6.5°C/km B. 0.65°C/km C. 65°C/km
Why do food chains and webs rarely support more than four or five trophic levels?
What will be an ideal response?