1) Scientists refer to a young turtles life as the lost years because during this time, sea turtles are hard to track.
2) The diagram, if showing only a male sea turtle, would not include the first step with the mother - i’m not 100% sure on this answer
3)The investeggator is designed to work would work during stage five when maturity is reached and they are wanting to breed. (i have no clue what the investeggator is meant to be)
4)Other threats that sea turtles may face would include predators, hunters, and other environmental issues. The threats would occur during stage 4 and 5 as they are more visible and would make for better prey.
5) Things that could help sea turtles vary; for instance, groups and protests could stop humans from hunting the animals. However, environmental issues would rely on the turtle to adapt. Predators on the other hand, another adaption needed as these are part of a food chain or web.
Hope this helps!