Which two cellular structures cells move around?
a. nuclei and cell walls
b. chloroplasts and endomembrane systems
c. cilia and flagella
d. ribosomes and mitochondria

The development of_ factored in the development of complex organisms.

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

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