Turtles mate, in male, female pairs. Much like a dog or other four legged animal, the male mounts the female and fertilizes her eggs.
Where things change is that the female then, typically, will find an unclaimed area, dig a hole in the sand, deposit the eggs into the hole, and then, at least partially, cover them with sand for the remainder of their gestational period.
When the baby turtles hatch, they make their way instinctively to the water, in hopes of avoiding most predators. "Turtle runs", as they are commonly known, are at their height when it is the darkest, as an added security measure.
There are some types of turles that live exclusively in the water, or who lay their eggs in the water. For them, the eggs are simply laid in an area where they are less likely to stand out, not necessarily buried. When the babies emerge, they will head to the surface for air, since they need oxygen.
*The same applies to tortoises, who are all rounded shell turtles.
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Sea turtles reproduce sexually, meaning that they require a male and female to fertilize the eggs. Mating typically occurs in the water, with the male using his front flippers to hold on to the female during copulation.
Sea urchins reproduce by releasing eggs and sperm into the water, where external fertilization takes place. Once fertilized, the eggs develop into larvae that eventually settle and grow into adult sea urchins. Some species of sea urchins can also reproduce by asexual means, such as splitting or budding.
Sexually. They are hermaphrodites and have both sets of sex organs, but sperm still has to meet egg.
Sea urchins reproduce sexually, with males releasing sperm into the water and females releasing eggs. Fertilization occurs externally, and the resulting larvae develop in the water before settling and growing into adult sea urchins.
Sea urchins reproduce sexually, with separate male and female individuals releasing eggs and sperm into the water for fertilization to occur externally. They can also reproduce asexually through a process called fragmentation, where a piece of the sea urchin's body can regenerate into a new individual.
Sea anemones do not give birth to live babies. They reproduce by releasing eggs and sperm into the water for external fertilization. The resulting larvae settle on the seabed and mature into adult sea anemones.