Four of the following statements correctly describe lichens. Which statement is the exception?
A. They inhabit harsh environments.
B. They contain a club fungus.
C. They may have preceded the evolution of land plants.
D. They may be a mutualism between an alga and a fungus.
E. They can contain cyanobacteria.
Answer: B
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Besides sending messages to and from the brain, the spinal cord has another important function: Reflexes. In fact, in very simple animals, that is the main function of the cord. In higher animals, reflexes are important because they provide
_____ protection from sudden or unexpected environmental harms. _____ stimulation of the brain as a protection against atrophy in situations where voluntary movement is hindered, such as a coma. _____ objective physical evidence of neurological injury. _____ maintenance of life-sustaining processes such as breathing and heart beat, even while sleeping or unconscious.
Why is the distance of the Earth from the sun so crucial for life as we know it?
a. The distance provides the optimal temperature for water to occur in a liquid form. b. The distance allows the Earth's orbit to have a year of a reasonable length. c. The distance allows for multiple seasons in temperate climates, which was crucial for development of different chemicals used to build the first protocells. d. The distance provides ample opportunity for water to freeze into ice. e. The distance ensures that ample water is available for all of the organisms on Earth.
Which of the following breaks down the slowest during decomposition?
A) simple sugars B) cellulose C) chitin D) lignin
Which of the following would have the smallest number of hydrogen ions (H+)?
A. A solution with the pH 2 B. A solution with the pH 6 C. A container of acetic acid (vinegar) D. A container of a strong base