What do eukaryote cells have that prokaryotes do not have?
a. dna
b. ribosomes
c. cell membranes
d. membrane-bound nucleus

What is thought to have caused the mass extinction at the end of the cretaceous period?

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.

What are the four stages of cell signaling?