Each homologous pair of chromosomes forms a "tetrad". The name tetrad is given because each pair contains
chromatids.

a) 2
b) 4
c) 6
d) 8

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

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some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle