Draw a cladogram that for the following animals: sponges, cnidarians, flatworms, echinoderms,
chordates, molluscs, annelids, nematodes, and arthropods. On your cladogram indicate the points
where the following evolved: 1) true tissues, 2) bilateral symmetry, 3) three germ layers, 4)
segmentation, 5) protostome development, and 6) deuterostome development What will be an ideal response?
Concepts to Consider: Before drawing your cladogram from memory, refer to Figure 30-7 on
textbook page 635.
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Which of the following statements is not true of nitrogen-fixing bacteria?
A. They live in root nodules. B. They are very common in symbioses with plants from the legume family. C. They are very common in symbioses in all plant families. D. Some are free-living in the soil. E. They provide an important way that biologically available nitrogen enters ecosystems.
When a nerve impulse travels from neuron 1 to neuron 2, neuron 1 is known as the _____
a. postsynaptic neuron b. presynaptic neuron c. synapse d. gated channel e. dendrite
With anorexia nervosa a person is not eating
enough to keep their weight within ___ percent of normal.
a. 2 b. 5 c. 10 d. 15 e. 25
Plants that produce separate male and female flowers are said to be
A) hermaphroditic. B) heterosexual. C) monoecious. D) dioecious. E) homosexual.