30. The length of human pregnancies from conception to birth varies according to the normal distribution with a mean of 266 days and a standard deviation of 16 days.
a. Almost all pregnancies (99.7%) of pregnancies fall within what length of days?
b. How long are the longest 2.5% of all pregnancies?
c. How short at the shortest 16% of pregnancies?
What is the probability that a pregnancy will last 272 days or longer?
e. What is the probability that a pregnancy will last 250 days or shorter?
f. What is the probability that a pregnancy will last between 250 and 290 days?
d.

Did the universe cool off or get hotter as it expanded after the 'big bang"?

Which of the following best describes the difference between “autobiography” and “memoir”? a. autobiography is written about the author's own interpretation of events; memoir is a written interpretation of events. b. memoir covers a particular time in the writer’s life or recounts life events around one or two themes; autobiography covers the entire story of the author's life and has multiple themes. c. autobiography covers the entire story of the writer's life and has multiple themes; memoir is a shorter written work with one theme. d. autobiography covers entire story of the writer's life and has multiple themes; memoir is the writer’s random memories about past experiences.

These two squirrels live in the same ecosystem. what type of interaction do the images represent? a. direct competition b. mutualism c. interference competition d. symbiotic e. indirect competition