Describe two important ways that marine ecosystem impact the planet

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird

Cells must be in osmotic equilibrium with their surroundings environments because if they swell or shrink thier membranes will rupture

Can happen anywhere along the spine if the neural tube does not close all the way. the backbone that protects the spinal cord does not form and close as it should. this often results in damage to the spinal cord and nerves. a) cleft palate b) spina bifida c) encephalocele d) down's syndrome