In the ecosystem shown here, what represents a producer? a) air b) a tree c) a giraffe d) a mountain

b) the tree, it is the only one of the options which produce its own food and food for others.

relationships play a major role in a human's emotional and mental wellbeing. healthy relationships with the people around you are even linked to a smaller production of cortisol, a stress hormone.

electronic measurement tools display data on a screen after waiting for several minutes.

while some business owners prefer manual record keeping systems, most businesses use an electronic record keeping system - making it easier to capture information, generate reports and meet tax and legal reporting requirements.

explanation: