During an investigation, sam observes the number of hummingbirds that come to his large bird feeder at different times of day. he fills the feeder to the top the first day and counts the number of birds at 6 a. m., noon, and 6 p. m. over ten days. what are the independent and dependent variables in sam’s investigation?

The dependent variable would be the number of birds and time of day (6 a.m., noon, 6 p.m.) would be the independent variable.

The independent variable refers to the variable the value of which is controlled or changed in the experiment whereas the dependent variable is the variable which is being tested or measured in the experiment.

The value of the dependent variable depends upon the value of the independent variable.

For example, a number of birds are being tested in an experiment due to which it is said to be a dependent variable.

thinking it would be d not too sure but i think it's right

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )