If O2 and N2 are present in equal amounts in an environment, both will have an equal chance of serving as an electron acceptor during respiration (that is, organisms do not have a preference as to which molecule is reduced)
A. true
B. false
B
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What is the hydronium ion (H3O+) concentration in a solution at pH 5?
A. 5 × 105 M B. 1 × 105 M C. 1 × 10-5 M D. 5 × 10-5 M E. 2 × 10-1 M
The production of chlorophyll molecules requires most plants to obtain __________ from the
soil.
a. calcium b. magnesium c. nitrogen d. potassium
What is chemical digestion?
A. The use of physical actions to break down food B. The absorption of food in the small intestine C. The use of villi to break down food D. The breakdown of food by enzymes
Choose the true statements about the diversity of Darwin's finches on the Galápagos Islands. Check all that apply.A) All of the finch species share a common ancestor that colonized the islands.B) Prior to the adaptive radiation of finches, there were no unoccupied habitats in the Galápagos Islands.C) Competition among finches for food sources led to character displacement of beak shapes.D) Beak shape is not an important key innovation.
What will be an ideal response?