What phylum contains sea jellies?
a. Porifera
b. Cnidaria
c. Echinodermata
d. Platyhelminthes
ANS: B
Cnidarians are carnivorous animals that have stinging cells. These are called cnidoblasts. The sea
jellies are in the medusa stage of cnidarians. Information can be found in the section Invertebrates Are
the Most Successful and Abundant Animals.
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One major cause of environmental problems is ____.
A. an increasing isolation from nature B. a reliance on ecosystem services C. sustainable resource use D. full-cost pricing E. chemical cycling
Why are seasonal changes less noticeable near the equator than at mid-latitudes?
What will be an ideal response?
The underlying principle of distance decay is the ________ ________ ________
Fill in the blank(s) with correct word
What is meant by territoriality, and how does it limit the effects of competition in nature?
What will be an ideal response?