All cells in our body (e.g., a neuron or muscle cell) possess a type of protein that the immune system uses to identify them as our own cells. This protein is
A. CD4.
B. lactoferrin.
C. MHC I.
D. MHC II.
E. antigen.
C. MHC I.
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Based on the graph of the mixed culture, what is happening?
a. formation of a dominance hierarchy b. interspecific competition c. resource partitioning d. an increase in species diversity
Ernst Mayr was responsible for ____
a. discovering new species atop New Guinea’s Foja Mountains b. standardizing a two-part naming system c. explaining the theory of natural selection d. describing the biological species concept e. identifying that all organisms contain DNA
As an overall average, about of the energy at one trophic level is available to the next-highest rank in the food chain.
A. 2% B. 20% C. 10% D. 7% E. 4%
Millennium Development Goal 4 is to reduce _________________ mortality.
Fill in the blank(s) with the appropriate word(s).