Is blackberry Jelly a homogeneous or heterogeneous mixture?

Homogeneous.

A homogeneous mixture is a mixture where the composition and properties are uniform throughout. In other words, it has the same appearance and composition throughout. Blackberry jelly is a homogeneous mixture because it has a uniform composition and appearance throughout. The jelly is made by mixing blackberries, sugar, and pectin, and then heating the mixture until it thickens. The resulting jelly is a homogeneous mixture because the blackberries, sugar, and pectin are evenly distributed throughout the jelly.