Cells in the human eye send nerve impulses to the brain that cause the pupil to constrict. this an example of an example of a reaction to what kind of stimuli?

a. chemicals
b. light
c. touch
d. sound

The health, management and conservation of biodiversity, is a challenge facing ecosystems worldwide. the major factors that affect the health and function of the great barrier reef are climate change and pollution. which question investigates the effects of a biotic factor on the reef ecosystem?

How was the climate when the ambulocetus was alive

The organelle pictured is found in cells of and is theorized to have once been an independent organism.