The mesenchymal capsule of the optic cup forms.
A. 1 Layer of Vascular Choroid
B. 1 Layer of Fibrous Sclera
C. 2 Layers: 1 Inner Layer of Fibrous Sclera + 1 Outer Layer of Vascular Choroid
D. 2 Layers: 1 Outer Layer of Fibrous Sclera + 1 Inner Layer of Vascular Choroid
E. 2 Layers: 1 Outer Layer of Fibrous Sclera + 1 Inner Layer of Photoreceptors
Answer: D. 2 Layers: 1 Outer Layer of Fibrous Sclera + 1 Inner Layer of Vascular Choroid
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A parasitic disease known as Schistosomiasis is caused by several species of flatworms in the
phylum Platyhelminthes. The life cycle includes an aquatic snail where the larvae develop; these larvae then hatch into the water and swim around until they find the appropriate vertebrate host. Adult males and females reproduce sexually in the vertebrate host, and eggs are usually shed into water via feces or urine. The snail would be considered a(n) __________.
a. intermediate host b. vector c. primary host d. cyst
Put the following stages of the phosphorus cycle in the proper order:
A. Feces and urine are released from animals into soil. B. Phosphorus is plentiful in rocks and soil. C. Phosphorus goes from rivers into the ocean. D. Phosphorus goes from soil into rivers. E. Phosphorus goes to higher trophic levels. F. Following uplifting, plants take in phosphorus. G. Ocean floor experiences an uplifting and releases phosphorus. 1. First stage 2. Second stage 3. Third stage
4. Fourth stage 5. Fifth stage 6. Sixth stage 7. Seventh stage
In any population, some individuals have forms of traits that make them better suited to their environment than others. This is referred to as a(n) ______ trait
a. selective b. healthy c. advantaged d. adaptive e. competitive
Recent studies have demonstrated evolution in some populations over a span of time as short as ____
a. single years b. decades c. centuries d. thousands of years e. millions of years