A robin makes its nest in a maple tree each spring, which helps to protect the eggs from predators, but neither harms nor helps the tree. Which of the following best describes this relationship?
a. Mutualism
b. Commensalism
c. Parasitism
d. Symbiosis
b. Commensalism
Commensalism best describes the relationship between the robin and the maple tree.
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Which of the following statements is the most accurate description of fruits and seeds?
A. "Fruits" and "seeds" are synonymous terms. B. Fruits always have fleshy coverings, while those of seeds are always hard. C. Fruits are structures that contain seeds and foster seed dispersal. D. Fruits contain endosperm but seeds do not. E. Fruits are produced only by angiosperms and seeds are produced exclusively by gymnosperms.
A common organism of the temperate infralittoral fringe (lower intertidal) is called:
a. Laminaria. b. Entermorpha. c. Ulva. d. lichen. e. giant kelp.
True or False: Hurricanes and other severe precipitation events have started becoming weaker and less intense as a result of climate change.
Answer the following statement true (T) or false (F)
Which bacteria cause Lyme disease?
a. Streptococcus pyogenes b. Staphylococcus aureus c. Escherichia coli d. Borrellia burgdorferi e. Bordetella recurrentis