What is the membrane of connective tissue that encloses the heart?

How can people get cancer? what types of cancer are there? plz i’ll mark u brainliest

Me d: which system contains the heart, blood, and blood vessels? a. muscular b. circulatory c. respiratory d. digestive which system contains the pituitary, adrenal, and thyroid glands? a. respiratory b. circulatory c. endocrine d. reproductive

First to answer will be the brainliest i need the answer asap