A student performed an investigation on green single-celled organisms called Euglena. Two samples of Euglena were
placed in two different containers of water taken from the same
source. One sample was kept in a dark area. The other sample
was kept in a lighted area. The student recorded the
observations in the table shown. Which of the following
observations represents a response to stimuli?
Select one:
Uses a flagellum to move
Moves toward light
Some divide into two small organisms
Various sizes

Use this diagram of an animal cell to answer the question. where does the first stage of cellular respiration occur? w x y z

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:

How do adaptation affect a species?