DNA contains four types of nitrogenous bases .One of these bases is -

Atypical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) what is the volume of the cell including the membrane? (b) what is the volume of the cell membrane? (c) what percent of the total volume does its membrane occupy? to simplify the calculations, model the cell as a sphere. enter your answers using four significant figures.

Climate warming trends allow plant and insect species to inhabit larger ranges. select the best answer from the choices provided

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