How does a volcano form? a magma repeatedly comes up from beneath the surface and solidifies into igneous rocks b lava comes up from beneath the surface and solidifies into metamorphic rock c magma at the surface hardens into metamorphic rock. d lava comes up from beneath the surface and hardens into igneous rocks

Archaebacteria use for movement. celia flagella pili cell walls

Ras is a g-protein that is activated when a growth factor attaches to egfr. its activation results in the replacement of a gdp molecule with a gtp molecule, thus allowing a signal transduction pathway to be activated. considering the signal pathway illustrated on this page, what is one potential outcome of a mutation in the ras gene that leads to ras protein hyperactivity. be specific.

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.