Final answer:
The statement regarding the largest dinosaurs living during the Early Cretaceous is false; they reached their peak size during the Late Cretaceous period.
Step-by-step explanation:
The statement that the largest dinosaurs lived during the Early Cretaceous is false. Dinosaurs, such as the Tyrannosaurus rex which weighed at least 7 tons, reached their peak in size and distribution during the Late Cretaceous period (145-65 million years ago). This period was near the tail end of the Mesozoic Era, which is also known as the 'Age of the Reptiles'. The Late Cretaceous was marked by a warm climate where even the poles lacked ice, and the continents were close to their present-day locations. Sadly, this period ended with a massive extinction, which included the demise of nearly all dinosaur species, except for the ancestors of modern birds.
The largest dinosaurs did indeed live during the Early Cretaceous period. During this time, dinosaurs reached their peak in size and distribution, with species like Tyrannosaurus rex weighing at least 7 tons. The period ended with the dramatic extinction of the dinosaurs, resulting in the loss of most of the large-bodied animals of the Mesozoic era.