Darwin noticed that birds that were good at finding scarce food in the winter had a better chance of surviving and producing offspring. what did he call this struggle for existence?

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

Which statement about dna replication is true? a. eukaryotes only have one circular chromosome that unwinds at multiple locations. b. eukaryotes can only replicate one segment of a chromosome at a time. c. prokaryotes can only replicate their single circular chromosome in the nucleus. d. prokaryotes only have one origin of replication to initiate replication.

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun