BRAINLIEST IF CORRECT 60 POINTS Which gas was only present in trace amounts in the atmosphere of early Earth?
A. oxygen
B. ammonia gas
C. carbon dioxide
D. sulfur gases

Aneuron is stimulated with an electric pulse. the action potential is detected at a point 3.70 cm down the axon 0.0052 s later. when the action potential is detected 7.20 cm from the point of stimulation, the time required is 0.0063 s. what is the speed of the electric pulse along the axon? (why are two measurements needed instead of only one? )

Which of the following statements is true of enzymes? a)they dont provide an active site for substrates to bind in a reaction b)they act on a specific type of substrate in a reaction c)they unusable after a reaction d)they change shape after a reaction

Read the article and use the information to answer the questions that follow discovering the structure of dna explain how the discoveries by rosalind franklin watson and crick build an accurate model of dna done