Charles darwin understood that evolution was a slow and gradual process. by gradual, darwin inferred a "stepwise" process with a species evolving and accumulating small variations over long periods of time until a new species was born. if evolution is gradual, there should be a fossilized record of small, incremental changes on the way to a new species. but in many cases, scientists were unable to find these intermediate forms. in 1972, evolutionary scientists stephen jay gould and niles eldredge proposed another idea of evolution. they suggested that species are generally stable, changing little for millions of years. this stable species becomes the victim of a rapid burst of change that results in a new species and that leaves few fossils behind. gould and eldredge proposed this new theory called

Based on the results of this study, what questions remain unanswered? how can these questions guide future research

In tossing one coin 10 times, what are your chances for tossing a head? a tail? 2. in tossing one coin 100 times, what are your chances for tossing a head? a tail? 3. in tossing one coin 200 times, what are your chances for tossing a head? a tail? deviation = ((absolute value of the difference between expected heads and observed heads) + (absolute value of the difference between expected tails and observed tails)) divided by total number of tosses. this value should always be positive. 4. what is the deviation for 10 tosses? 5. what is the deviation for the 100 tosses? 6. what is the deviation for 200 tosses? 7. how does increasing the total number of coin tosses from 10 to 100 affect the deviation? 8. how does increasing the total number of tosses from 100 to 200 affect the deviation? 9. what two important probability principles were established in this exercise? 10. the percent of occurrence is the obtained results divided by the total tosses and multiplied by 100%. toss the coins 100 times and record your results. calculate the percent occurrence for each combination. percent head-head occurrence: percent tail-tail occurrence: percent head-tail occurrence:

Which codon is the code for the amino acid histidine (his)?