Although there are fewer than 14,000 living species of seedless vascular plants, they were the
dominant plants on Earth for nearly 200 million years. Their dominance ended at the end of the
Carboniferous period, about
a. 1.5 billion years ago.
b. 420 million years ago.
c. 250 million years ago.
d. 125 million years ago.
e. 17 million years ago.
C
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In insects and spiders, __________ take up fluid, uric acid, and solutes from the blood and deliver them to the gut. Fill in the blank(s) with the appropriate word(s)
The exchange of genetic material between nonsister chromatids of a homologous pair in meiosis is called ________
Fill in the blank(s) with correct word
To which of the following groups does the organism
in the above figure belong? a. diplomonads, parabasalids, trypanosomes, and euglenoids b. ciliates, dinoflagellates, and apicomplexans c. water molds, diatoms, and brown algae d. chlorophyte and charophyte algae e. none of the above
What type of reproductive isolation would include closely related species of orchids that never mate in the wild because they bloom at different times?
What will be an ideal response?