Which of the following is a function of some of the specialized cells in the stomach? Select one:

Transmit signals to instruct the organ to begin churning.

Reabsorb water to maintain the internal balance of the system.

Absorb proteins that have been released through digestion.

Secrete hydrochloric acid to aid in the breakdown of food.

Fossils found in strata reveal that a) innate drive to complexity of life b) unused body parts decrease in size c) older strata carry fossils that differ greatly from living organisms d) geologic changes occur quickly on earth

Which statement describes characteristics of planarians? a they live in oceans, are parasites, and reproduce only sexually. b they live in fresh water, are parasites, and reproduce only asexually. c they live in oceans, are free living, and reproduce sexually and asexually. d they live in fresh water, are free living, and reproduce sexually and asexually.

The earth's oceans are made up of chlorine, and trace elements. a) carbon, oxygen b) oxygen, silicon c) hydrogen, oxygen d) nitrogen, oxygen