Under the biological species concept, a species is a group of organisms that
A) are physically similar.
B) share a recent common ancestor.
C) live together in a location and carry out identical ecological roles.
D) have the potential to interbreed in nature and produce fertile offspring.
Answer: D
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UV radiation on the skin can cause ________ .
a. vitiligo b. benign melanoma c . squamous cell carcinoma d. acne e. cold sores
Which structure present in the moss life cycle is diploid?
A. Archegonia B. Spore C. Gametophyte D. Protonema E. Zygote
Which sentence best describes fluorescence?
a. A pigment molecule accepts a high-energy electron and releases a photon of energy. b. A high-energy electron leaves its nucleus and moves to a different molecule. c. A high-energy electron returns to its ground state by releasing energy in a photon. d. A low-energy electron moves to a high-energy state by absorbing heat.
Transporters, in contrast to channels, work by ________________.
What will be an ideal response?