Saltwort (Batis) maintains osmotic balance with
a. succulent stems.
b. salt glands.
c. salt leaves.
d. they cannot maintain osmotic balance; they are osmoconformers.
e. salt filtration mechanisms in the roots.
A
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Recent fossil discoveries may represent the earliest animal species ever found. How old are they?
a. 430 million years old b. 25 million years old c. 650 million years old d. 5 billion years old
The molting hormone of arthropods is:
a. corticotropin b. MSH c. oxytocin d. ecdysone e. adrenalin
Exposure to a light source
a. decreases melatonin levels. b. increase melatonin levels. c. decrease testosterone levels. d. is used to treat SAD and jet lag. e. does more than one of these
The shallow shoreline region of a lake where enough light reaches the bottom for photosynthesis to occur is the _____ zone.
A. limnetic B. littoral C. profundal D. pelagic E. benthic