The concept of homeostasis originated with:
A. Claude Bernard.
B. Charles Darwin.
C. James Watson.
D. Rosalind Franklin.
E. Gregor Mendel.
A. Claude Bernard.
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A ______ usually is the lymphoid tissue first to encounter pathogens and antigens that enter via the nose and mouth.
A. lymph node B. tonsil C. thymus D. spleen
An amino group is weakly basic and includes a(n) ____ atom covalently bonded to two hydrogen atoms
a. sulfur b. carbon c. oxygen d. nitrogen e. phosphate
Upon closer inspection of the leaves of "flower of stone," one can observe tiny, cone-like structures. Each cone-like structure emits spores of two different sizes
Further investigation also reveals that the roots of "flower of stone" branch only at the growing tip of the root, forming a Y-shaped structure. Based on these additional observations, which of the following can be properly inferred about "flower of stone"? 1. It is heterosporous. 2. It is a fern. 3. The cone-like structures are sori. 4. It is a lycophyte. 5. It has separate male and female gametophytes. A) 1 and 5 B) 2 and 3 C) 1, 2, and 3 D) 1, 4, and 5
An acid is a substance that, in solution, releases
A. oxygen ions in H2SO4. B. hydrogen ions, for example, HCl. C. —COOR ions from beer. D. chloride ions from NaCl.