Chemical released by t cells for direct cell killing

What is the name of the tool scientists use to identify a species? species key dichotomous key species marker dichotomous marker

Write at least four pages on the relationship of circulation and integumentary systems. identify common conditions and diagnosis population prevalence if applicable signs and symptoms of each condition or disease treatment options potential complications or progress along health-illness continuum

Will mark brainliest! + 20 pts which belief about interpersonal behavior should healthcare providers be aware of when treating patients?