The valve that controls the passage of chyme from the small intestine into the cecum is called the:

When can groundwater become part of lakes or rivers?

Which is a part of the cell theory? cells come from pre-existing cells cells have a nucleus organisms with one cell must be seen with a microscope organisms must have more than one cell to live

Which element is the basis for all living things and can combine with other elements in many ways? phosphorus carbon oxygen sulfur

Bacteria reproduce through binary fission. Binary fission is a simpler process than mitosis in plants and animals because bacteria? are able to produce spores. do not undergo cytokinesis. do not have a nucleus. are single-celled organisms.

What city is located at approximately 45° north latitude and 85° west longitude?

How many centrioles are there in a cell metaphase? 2 4 6 8 None

How is tidal energy collected?

Darwin hypothesized that a new species could appear through small changes in an ancestral species. Which observation that he made about finches most supports that hypothesis

Where do amoebas live and what are their geographic range?

What is the body mass index for a person who is 70 inches tall and weighs 202 pounds?