They come from eggs. The sea urchin's eggs rise to the surface of the water and float around for several months. Then they hatch out.
The sea archin releses sperm and eggs in to the water the eggs then get firtilised
No, they lay eggs.
Sea urchins are purple, red, orange, yellow/orange, and a mix of red and purple.(Sea Urchins come in many shapes sizes and colors.)
Sea urchins are purple, red, orange, yellow/orange, and a mix of red and purple.(Sea Urchins come in many shapes sizes and colors.)
Eggs of a marine animal such as fish or sea urchins.
they give birth~ Sea urchins generally have separate sexes and spawn seasonally every year. Eggs and sperm are usually released to the water column where fertilisation occurs.
Sea urchins generally have separate sexes and spawn seasonally every year. Eggs and sperm are usually released to the water column where fertilisation occurs.
No. Sea urchins live in the sea.
Sea urchins live in the sea, rock pools, kelp forests, and coral reefs
One of the features that made sea urchins a popular model system was the ability to shed gametes into the sea water after intracoelomic injection of potassium chloride (KCl). In the case of eggs, the coelomic injection results in release of eggs from the gonopore; the animal is inverted over a beaker of sea water, and the eggs are released into the beaker.
The female sea urchin produces several million eggs per year, and the reproductive organs of a sea urchin can be up to 80 percent of a sea urchin's mass during mating season.