The defining characteristics of the phylum Arthropoda are:
A. jointed legs, ecdysis, and an exoskeleton
B. antennae, six legs, and mandibles
C. compound eyes, book lungs, and the hemocoel
D. Malphigian tubules, ommatidia, and tagmata
E. spiracles, cephalothorax, and proboscis
A. jointed legs, ecdysis, and an exoskeleton
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Unique features of the planctomycetes include ________.
A. a membrane-bound nuclear region B. resistance to ionizing radiation C. their size: some are as large as protozoa D. twitching fimbriae that are required for motility
What is a shared characteristic of flatworms and nematodes?
a. Poorly developed excretory systems b. Complete digestive systems c. Tough, inflexible exoskeletons d. Complete respiratory systems
Discuss two hypotheses that attempt to explain the high species richness in the tropics
What will be an ideal response?
In the accompanying figure, a(n) ____ has body plan B
a. Pseudocoelomate b. eucoelomate c. radially symmetrical d. echinoderm e. acoelomate