What is one difference between primary and secondary succession?

a. primary succession is slow and secondary succession is rapid.
b. primary succession modifies the environment and secondary succession does not.
c. secondary succession begins with lichen and primary succession begins with trees.
d. secondary succession begins on soil and primary succession begins on newly exposed surfaces.

Aboy jumps into a cold swimming pool and his body tempature goes down hus muscles ,blood vessels

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 box will not accelerate? 4 newtons 4 newtons 4 newtons 25 kg 4 newtons 15 newtons 10 kg 30 newtons 40 newtons 50 kg 30 newtons 30 newtons