The pollen grains of pine each consists of three cells
____________________ Indicate whether the statement is true or false.
F, four
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Which type of modified stems are typical of plants that historically have needed to protect themselves from mammalian herbivores?
A) blades B) tubers C) stolons D) thorns E) rhizomes
Answer the following questions
a. Over time, pressure and heat transformed the compacted organic remains of Carboniferous forests into ____. b. Ancient relatives of ____ and ____ dominated in the Carboniferous forests.
If I tested your intestinal fluid and found that it was basic, which of the pH values listed would best describe this solution?
A) 6.8 B) 3.2 C) 1.2 D) 8.0
The atmosphere of early Earth is currently thought to have contained:a
methane, water, ammonia, nitrogen, and oxygen b. carbon dioxide, water, oxygen, nitrogen, and hydrogen c. carbon dioxide, ozone, nitric oxide, water, and hydrogen sulfide d. carbon dioxide, water, carbon monoxide, hydrogen, and nitrogen e. carbon dioxide, carbon monoxide, water, hydrogen, and nitric oxide