What is the primary evidence that forms the basis of seafloor spreading? a. the rocks on the mid-oceanic ridges change densities in a symmetrical manner. b. the magnetic properties of rocks along the mid-oceanic ridges change alignment in a symmetrical manner. c. the rocks along the mid-oceanic ridges show age patterns in a symmetrical manner. d. the rocks along the mid-oceanic ridges have mineral patterns in a symmetrical manner.

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

This is the interaction of two organisms where one is and the other is neither nor harmed.