On a phylogenetic tree, which of the following would you expect to have evolved first?
A)mechanoreceptors
B)chemoreceptors
C)thermoreceptors
D)nociceptors
E)photoreceptors

Question

Quizplus · Accepted Answer

Chemoreceptors are believed to have evolved first among the options given. They are essential for detecting chemical stimuli in the environment, a fundamental requirement for the survival of early life forms, allowing them to find food and avoid harmful substances. This basic form of environmental interaction predates the specialized senses like vision, temperature sensitivity, mechanical sensing, and pain detection, which would have evolved later as organisms became more complex.

On a Phylogenetic Tree, Which of the Following Would You