In this diagram showing fertilization of a flowering plant, which structure is the egg?
1.A
2.B
3.C
4.D
3
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In all deuterostomes, the cells divide parallel to and at right angles to the polar axis. This pattern is called _______________.
Fill in the blank(s) with the appropriate word(s).
After ten years of hard work and intensive study, you complete your PhD in botany. Your dissertation is celebrated in your field, and your adviser informs you that you can choose any plant in the world to continue your research. Without hesitation, you choose one of the strangest plants on the planet, the Welwitschia! But this rare species, the singular in its genus, can be found in only one place. Where must you travel to research this bizarre and fascinating plant?
a. Siberia b. New Guinea c. Namib d. Tibet
Which of the following is the best definition of
sympatric speciation? a. species that evolve due to geographical distance b. mechanical isolation acts to prevent speciation c. breeding behavior that prevents the organisms from breeding due to differences in their breeding time d. ecological isolation e. evolutionary change that creates two species occupying the same space
In flatworms, the action of ciliated __________ draws interstitial fluid into a system of tubes that delivers it to the body surface.
Fill in the blank(s) with the appropriate word(s).