What are the symptoms of myeloid and lymphoid leukemia?

Is the alien theory a scientific claim? why or why not? just took the test it was , : " the alien theory is not a scientific claim because it is not based on valid data, there is no evidence to support it, and it does not come from a reliable source."

The momentum of an isolated system is conserved a) only in inelastic collisions. b) only in elastic collisions. c) in both elastic and inelastic collisions

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2