The outermost of the three primary germ layers is the ________
a. endoderm
b. epidermis
c. mesoderm
d. ectoderm
d
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Although nitrogen can act as a fertilizer initially, too much nitrogen added to a forest system can cause forest decline
Indicate whether the statement is true or false
Who am I? I have the same photosynthetic pigments as plants, but I can also obtain nutrients by
ingestion. a. plasmodium b. Amoeba c. euglenoids d. Giardia e. Paramecium
Which of the following is a true statement about sexual vs. asexual reproduction?
A) Asexual reproduction, but not sexual reproduction, is characteristic of plants and fungi. B) In sexual reproduction, individuals transmit half of their nuclear genes to each of their offspring. C) In asexual reproduction, offspring are produced by fertilization without meiosis. D) Asexual reproduction produces only haploid offspring.
In Situation 25.1, fecal samples were found to be negative when cultured. The next step in diagnosing the cause of illness would be
A) to begin antibiotic therapy. B) blood cultures. C) microscopic examination of feces for oocysts. D) microscopic examination of feces for viruses. E) muscle biopsy.