Earth/space during which periods did dinosaurs exist? select all that apply. a. triassic b. jurassic c. devonian d. cretaceous e. pennsylvanian

The answers are A). Triassic, B). Jurassic and E). Cretaceous

Explanation: Mesozoic era was the period when dinosaurs lived. It was million years ago before the Homo Sapiens start existing. The era was divided into 3; Triassic, Jurassic and Cretaceous.

The Triassic is the first and shortest period of the Mesozoic Era, It was in this environment that the reptiles known as dinosaurs first evolved.

The Jurassic constitutes the middle period of the Mesozoic Era, also known as the Age of Reptiles. Many large land animals were wiped out but the dinosaurs survived, giving them the opportunity to evolve into a wide variety of forms and increase in number.

The Cretaceous is the third and final period of the Mesozoic Era. It was during this period dinosaurs evolved independently in different parts of the world, becoming more diverse. Other groups of organisms also diversified. The first snakes evolved during this time, as well as the first flowering plants. Various insect groups appeared, including bees, which helped increase the spread of flowering plants.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.

new communications technology has affected the way social movements are organized because nowadays, social movements rely on social networks and the media to get different people with a similar way of thinking in contact, and thus, get them to mobilize for a greater cause.

individuals only participate in collective action when they feel identified with it. is in this aspect that social media becomes relevant, because it guarantees communication among all individuals and organizes the social actions that are going to be carried out, i.e., the social movements.

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in conclusion, it is by social networks and social media that social movement is given birth; by connecting different individuals with similar ideas and organizing them to mobilize for a greater cause.