All ecosystems need energy. What is the originating source for most of the energy that powers ecosystems on this planet?
A) Geothermal energy
B) Wind energy
C) Solar energy
D) Potential energy
C
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The physical features and chemical composition of the rocks that contain fossils provide information about the ____ in which the fossil organisms lived
Fill in the blank with the appropriate word.
Directly on the underside of the fruiting body of a mushroom, you will find __________
a. hyphae b. mycelia c. seeds d. spores
Which risk factor is associated with cancer of the colon and rectum?
A) tobacco B) viruses C) UV radiation D) dietary fat
Molecular-based phylogies place the phylum Platyhelminthes in the Protostomia. How do scientists best explain the morphological differences between flatworms and the other members of the Lophotrochozoa?
A. Modern Platyhelminthes do not have a coelom but did originate from an ancestor that had one. B. The Platyhelminthes clade separated from other clades before coeloms evolved and consequently Platyhelminthes have never had a coelom. C. Platyhelminthes evolved from an ancestor without a coelom but developed one during the course of their evolution. D. Some Platyhelminthes have a coelom but others do not and it is difficult to conclude anything about its evolution within the clade. E. Platyhelminthes originated from ancestors with a coelom and have retained it to the present time.