What happens to fat when it initially enters the small intestine?

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Which of the following is an effect of the uneven heating of the earth by the sun? a sea breeze a land breeze a convection current all of the above

Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this