Explain why a feather falls at the same rate as a hammer on the moon

If two compounds have the same LD50(lethal dose 50) value, are they equally as toxic? Explain why or why not. Include a graph to illustrate your point and explain what the graph is showing in your answer. 

Answer the following question:

1. In your own words, explain why, if two compounds have the same LD50 value, they aren’t necessarily as toxic. Make sure to include the term Threshold in your answer. 

Please answer all 4 questions correctly.

1. Applying Concepts 

All mammals have the same size hearts relative to their body size. Do their hearts beat at the same rate?

2. Interpreting Data

a. What is the resting pulse rate of a 7,000-kilogram African bull elephant?

b. What is the resting pulse rate of a 20-gram mouse? How many complete heartbeats is that per second?

c. What general statement can be made regarding the effect of body size on heart rate in mammals?

3. Making Inferences

a. The data in the graph, plotted on logarithmic coordinates (that is, the scale rises in powers of 10), fall nicely upon a straight line. How would you expect them to look plotted on linear coordinates?

b. As you walk through the graph from left to right, the line slopes down. This is called a negative slope. What does the negative slope of the line signify?

4. Drawing Conclusions

If you plotted data for an experiment measuring body mass versus resting oxygen consumption, you would get exactly the same slope of the line as shown in this graph. What does this tell us about why body size affects heart rate in mammals as it does?