Why might a larger brain in early mammals be related (at least in part) to their "miniaturization" from the cynodont condition?
What will be an ideal response?
Brain size in vertebrates scales with negative allometry. We usually express this as the notion that relatively bigger animals have proportionally smaller brains, but of course it also means that relatively smaller animals have proportionally bigger brains.
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Spermiogenesis is the last stage of meiosis.
Answer the following statement true (T) or false (F)
After birth, the remnant of the umbilical vein becomes the
A. fossa ovalis. B. ligamentum venosum. C. medial umbilical ligament. D. ligamentum teres. E. ligamentum arteriosum.
The anterior pituitary gland develops from the embryonic pharynx.
Answer the following statement true (T) or false (F)
Cytotoxic T-lymphocytes that have killed a foreign cell may transform into
A. helper T-lymphocytes. B. memory B-lymphocytes. C. plasma cells. D. natural killer cells. E. None of the choices is correct.