noun, Cell Biology. 1. a network of tubular membranes within the cytoplasm of the cell, occurring either with a smooth surface (smooth endoplasmic reticulum) or studded with ribosomes (rough endoplasmic reticulum) involved in the transport of materials.
The most widely distributed of all sea turtles; found in the Gulf of Alaska and south of the Bering Sea in the northeastern Pacific to Chile in the southeastern Pacific. In the Barents Sea, Newfoundland and Labrador in the North Atlantic; around Argentina and South Africa in the South Atlantic.
Sea turtles have roamed Earth's oceans and seas for millions of years! The first sea turtles were on Earth nearly 150 million years ago! Six species of sea turtles in oceans around the United States are either threatened or in danger of extinction:1  green turtle. 2  hawksbill turtle. 3  Kemp's ridley turtle.4  leatherback turtle.ea Turtles. Sea turtles have roamed Earth's oceans and seas for millions of years! The first sea turtles were on Earth nearly 150 million years ago! Six species of sea turtles in oceans around the United States are either threatened or in danger of extinction: 1  green turtle. 2  hawksbill turtle.