Lower viscosity and low gas content mean higher temperature of magma.
Explanation:
Viscosity of magma, the resistance to flow depends on composition of the magma and temperature. Higher silica content means higher viscosity. But lower temperatures and low gas content mean higher viscosity.
Viscosity is the resistance to flow (opposite of fluidity). Viscosity depends on primarily on the composition of the magma, and temperature. Higher SiO2 (silica) content magmas have higher viscosity than lower SiO2 content magmas (viscosity increases with increasing SiO2 concentration in the magma).
Animals that have adaptations that make them more successful in their environment will survive. It depends on the traits they inherit from their parents and whether that trait is beneficial, neutral or harmful.
