Most members of this lineage of Cnidarians have both polyp and medusa stages in their life cycles,
with the polyp stage typically forming a colony. Species of Obelia are members of this lineage.
a. Hydrozoa
b. Scyphozoa
c. Trematoda
d. Cubozoa
e. Anthozoa
A
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Which list represents the hierarchy of muscle structure from the largest unit to the smallest?
a. muscle fiber ? myofibril ? sarcomere ? filaments b. myofibril ? muscle fiber ? sarcomere ? filaments c. sarcomere ? myofibril ? filaments ? muscle fiber d. muscle fiber ? sarcomere ? myofibril ? filaments e. muscle fiber ? filaments ? myofibril ? sarcomere
Which of the following is the primary function of
pollen grain coats? a. differentiates upon contact with the flower b. protects from harsh chemicals and dehydration c. prevents competing pollen grains from being able to fertilize a flower d. provides an aerodynamic structure to allow them to travel on wind currents e. none of these
The first photosynthetic autotrophs used the energy of the sun to split H2O because it is not very electronegative
______________ Indicate whether the statement is true or false.
Lampreys have reduced the size of commercial fish populations in the Great Lakes because they
A) secrete toxins that injure or kill other fishes. B) are predators to many of the same prey species. C) compete for food with those fish species. D) are parasites on those fish species. E) share many of the same predators.