Which of the following sequences is an example of a point mutation of the dna sequence -a-a-g-t-g-c-? a. -a-a-a-t-g-c- b. -a-a-g-u-g-c- c. -g-t-a-g-a-a-c- d. -a-a-g-g-t-c-

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

In a leaf, dermal tissue a) stores food b) stores carbon dioxide c) releases oxygen into the air d) transports water from the roots