please help :) In an experimental investigation, the variable that the researcher changes or manipulates in order to see its effects is called the blank variable.

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called

According to these anatomical structures which two animals are probably most closely related

How does the fossil record provide evidence that the modern whale evolved from the anthracotheres? a) the modern whale looks like their ancestor the anthracotheres. b) the modern whale has all of the same structures as their ancestor. c) there is not enough evidence to suggest the the modern whale evolved from the anthracotheres. d) the anthracotheres has a structure that is still present in the modern whale, but is no longer of use to the modern whale.