If you back far enough, everything lived in the sea. At various points in evolutionary history, enterprising individuals within many different animal groups moved out onto the land, sometimes even to the most parched deserts, taking their own private seawater with them in blood and cellular fluids. In addition to the reptiles, birds, mammals and insects which we see all around us, other groups that have succeeded out of water include scorpions, snails, crustaceans such as woodlice and land crabs, millipedes and centipedes, spiders and various worms. And we must""t forget the plants, without whose prior invasion of the land none of the other migrations could have happened.
Choose NO MORE THAN TWO WORDS from the passage for each answer.
1. What had to transfer from sea to land before any animals could migrate?