Pl help me in a cross-section of soil, what does a horizontal consist of

a) clay, minerals, and little humus

b) humus only

c) partly weathered rocks

d) topsoil

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.

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?

When rutherford performed his metal foil experiment, he was surprised that most of the alpha particles