The three greatest current threats to biodiversity, in order starting with the greatest, are
A) habitat loss, overharvesting, and invasive species.
B) habitat loss, invasive species, and overharvesting.
C) invasive species, habitat loss, and overharvesting.
D) invasive species, overharvesting, and habitat loss.
Answer: B
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Where within a eukaryotic cell is ribosomal RNA (rRNA) synthesized?
A) cytoplasm B) lysosome C) mitochondrion D) nucleolus
The xylem primarily transports ________, while the phloem primarily transports ________.
A. water and minerals; sugars B. water and minerals; oxygen C. sugars; water and minerals D. oxygen and carbon dioxide; sugars
The structures labeled “A” and “C” in the figure are
a. dikaryotic hyphae. b. gametangia. c. of different mating strains. d. zygospores. e. all of these.
If a person gets a shot of epinephrine, he or she almost immediately feels the effects (e.g., increased heart and breathing rates). If the same person gets a shot of a steroid hormone such as cortisone, there is no immediate response
What is the reason for this difference?