20. What do scientists use to provide evidence that the earth has a solid inner core and a liquid outer core?
(1 Point)
A) drilling into the mantle
B)seismic wave
C) radar
D)x-rays
21. The layer of the atmosphere closest to the surface of the earth is called the
(1 Point)
A) Stratosphere
B)exosphere
C)mesosphere
D) troposphere

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

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.

What makes a dominant allele different from a recessive allele