Which is observation proves that a cell is a eukaryote? A. it has DNA in the cell
B. it has ribosomes inside the cell
C. it has enclosed organelles inside the cell
D. it is surrounded by a cell membrane

b. the carbon cycle ensures living things have a source of hydrogen

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

nucleus

would be most reasonable answer tbh