A single species can feed at only one tropic level

True

False

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million