Alders are trees with symbiotic nitrogen fixing bacteria in their roots. This enables alders to be a key part of _________ in recently glaciated areas in Alaska.
A. species extinction
B. emigration
C. primary succession
D. inhibition
E. secondary succession
C. primary succession
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While innate immunity is ancient and universal amongst animals, the adaptive immune system is generally considered to be unique to the vertebrates. However, some researchers have suggested, with much controversy, that invertebrates may have a form of adaptive immunity as well. What sort of evidence would be required to fully demonstrate such a claim? (Check all that apply.)
_____ B and T cells _____ CD4 receptors _____ efficacy of vaccination _____ highly variable molecules that can bind various antigens _____ identified cells that are necessary to provide acquired immunity _____ immunoglobulin molecules _____ resistance upon second exposure to a pathogen _____ specific resistance to one strain but not another after exposure _____ thymus gland _____ Toll-like receptors
Hereditarianism is the idea that human traits are ____
A. partly influenced by environment and genes B. influenced mostly by the genetic make-up C. influenced equally by genes and environment D. determined solely by the genotype or genetic make-up E. none of these
Which cells stimulate B cells to divide and produce antibodies?
a. mast cells b. macrophages c. NK cells d. TC cells e. TH cells
the __ is the gonad and the __ is the gamete
Fill in the blank(s) with the appropriate word(s).