When we found the ancient cave drawings, Mark jokingly shouted ooga booga and made everyone laugh.

Oogamy, a reproductive pattern where the female gamete is large and non-motile while the male gamete is small and motile, evolved early in many lineages.

She yelled, 'oogabooga!' to scare her friends.

The marine biologist documented an oogamous mating system in the coastal algae.

The freshwater algae reproduced oogamously during the spring bloom, producing large immobile eggs and tiny motile sperm.

In many algae, oogametes are larger than the motile male gametes and store nutrients for the future zygote.

In the biology lab, she observed the oogamete under the microscope and recorded its morphology.