Examlex
Which of the following sexual disorders is characterized by the inability of a man to attain or maintain an erection until the completion of sexual activity?
Silurian Period
A geologic time period that occurred roughly 443.8 to 419.2 million years ago, characterized by significant biological diversity and the early development of terrestrial ecosystems.
Ediacaran Period
The last (most recent) period of the Proterozoic eon, from 635 million to 541 million years ago; named for early animal fossils found in the Ediacara Hills in South Australia.
Gymnosperms
A group of seed-producing plants that include conifers and cycads, characterized by having seeds that are not enclosed in an ovary (fruit).
Large Dinosaurs
Large dinosaurs were prehistoric reptiles, including species like the Tyrannosaurus rex and Brachiosaurus, known for their massive size and diversity during the Mesozoic era.
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