Purple loosestrife, a European plant, was introduced into the American Great Lakes region where it has no natural predators. Each plant produces thousands of seeds annually, and it now clogs acres of wetlands, crowding out native plants Purple loosestrife is considered a(n)
A) predator.
B) replacement-level fertility species.
C) invasive species.
D) density-independent species.
E) density-dependent species.
C
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The figure below illustrates that
A. genetic changes in an ancestral Pax6 gene contributed to the evolution of the mammal eye, while the Drosphilia eye arose independently.
B. most animal species have eyes with one photoreceptor and one pigment cell.
C. eye complexity has not significantly increased since the late Triassic when most modern insect families arose.
D. the retina and cornea developed first, but then were secondarily lost in insects such as Drosphilia.
E. although the mammal eye possesses more cell types and greater complexity than the Drosphilia eye, both arose from genetic changes to an ancestral Pax6 gene.
________ bonds hold together the polypeptide chains that form an antibody.
A) Disulfide B) Peptide C) Hydrogen D) Phosphodiester
Refer to the accompanying figure. What is the function of the structure labeled as 6?
a. digestion b. food intake c. water discharge d. waste elimination e. asexual reproduction
The process by which an oocyte bursts from an ovary and usually enters an oviduct (Fallopian tube) is called ____________.
Fill in the blank(s) with the appropriate word(s)