Provide an ultimate and proximate cause explanation for altruism. Be sure to use the following terms in your stimuli, evolution, kin selection

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

Which statement describes an endocrine function rather than an exocrine function? a. salivary glands release saliva into the mouth. b. sweat glands release sweat onto the skin c. the pineal gland releases melatonin into the blood. d. esophageal glands release mucus into the esophagus.

If animal agriculture was eliminated, how much grain would become available for human consumption?