A non-energy requiring process that moves materials across a cell membrane with the concentration gradient.

Which blood component produces antibodies? a) platelets b) red blood cells c) white blood cells d) serum

How does the gradient of a river affect its flow

What type of cells line the ventricles of the brain?

Which is a cell of the nervous system? dendrite sodium axon neuron

Which is a defining trait of a mineral? A. amorphous B. made of carbon C. shiny D. definite chemical composition

What is one similarity between replication and transcripton

Fossils on the continent may be similar to fossils on another continent. This observation supports which theory?

Jane filled one transparent bottle and one brown bottle of the same capacity with pond water. She kept the first bottle in sunlight and the second in dark. After one hour she calculated the amount of oxygen present in both the bottles.

The kingdom contains all autotrophic organisms.

Bacteria cell traits