Fossils allow scientists to determine when and for how long a certain species lived.
what can scientists deduce from this discovery?
a.
earth's life has changed over time
b.
which fossils are heavier
c.
the food sources that were available
d.
explain how earth remained unchanged

The density of a liquid could be found by using

Which fators influence ocean currents

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).