Which of the following describe glands? Check all that apply. a structure that secretes substances through a duct

a thin layer that separates or connects structures inside the body

a structure that secretes hormones into the bloodstream

a structure usually made from connective and epithelial cells

(04.05 hc) analyze the given diagram of the carbon cycle below. part 1: which compound does c represent? part 2: name a process that could release this compound into the air. part 3: explain how the elements that form it are conserved during the carbon cycle. use complete sentences to explain your answer. justify how this compound was created from a recycling of carbon in the carbon cycle. use complete sentences to explain your answer.