Woolly mammoths disappeared from North America during which extinction event?
a. end-Devonian extinction
b. end-Cretaceous extinction
c. Pleistocene extinction
d. Holocene extinction
c. Pleistocene extinction
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Primary production in the sandy beach is primarily by:
a. seagrasses. b. diatoms. c. dinoflagelletes. d. mangals. e. both b and c
What is a retrotransposon, and how does it differ from typical transposons?
What will be an ideal response?
You have fractured your bone and your physician is explaining the healing process to you. She tells you that after the blood clot forms, the next step is the development of the callus. Which of the following describes the structure of the callus?
A) osteoclasts B) compact bone C) cartilage D) spongy bone
Sexually dimorphic features do no include
A. Body size B. Horns C. Intelligence D. Colored plumage E. Antlers