What are the signal transduction pathway

The influenza virus cause the flu, but not other diseases. why?

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?