A student-designed an experiment to test the hypothesis given below. Hypothesis: The number of mitochondria in the muscle cells of girls increases with age.
What is the best independent variable for this experiment?
number of mitochondria
number of muscle cells
gender of the subjects
age of the girls

Awater molecule is polar because there is an uneven distribution of these between the oxygen and hydrogen atoms.

Populations of blue-winged warblers, a type of bird, migrate south in the winter and return to canadian breeding grounds in the spring. as global temperatures have increased due to climate change, spring has started arriving in the warbler's breeding grounds earlier in the year, before the warblers return. warblers now arrive at their breeding grounds too late to select ideal nesting sites and to feed on important early-spring food sources how are populations of blue-winged warblers most likely to be affected by the earlier arrival of spring? o a. populations will go extinct since the warblers will stop migrating to breeding grounds. b. populations will be unaffected since most species can quickly adapt to effects of climate change. c. populations will increase since warmer temperatures are generally beneficial to survival, d. populations will decline since individuals will be less likely to successfully reproduce, reset next

How do chloroplasts set plants apart from other living things