![]() ![]() Pieces of potato are cut to similar sizes, weighed, and then placed in one of the six solutions overnight. The solutions range from no solute to a high concentration of solute and are 0.0 (distilled water), 0.2, 0.4, 0.6, 0.8 and 1.0 molar sucrose. The solute is sucrose and the concentrations are measured in units of molarity. The experiment uses pieces of potato that are placed in six different solutions of water each with a different solute concentration. Reptiles evolved somewhat later.In this activity, we are going to explore osmosis by looking at a dataset produced with a classic classroom experiment. They were reptile-like, but not actually reptiles. The earliest amniotes probably looked something like this. The sauropsids gave rise to reptiles, dinosaurs, and birds.Įarly Amniote. Within a few million years, two important amniote groups evolved: synapsids and sauropsids. They may have looked like the animal in Figure below. The earliest amniotes evolved about 350 million years ago. Amniotic eggs were the first eggs that could be laid on land. Therefore, in an amniotic egg, an embryo can breathe without drying out. ![]() The membranes let gases but not water pass through. Amniotes are animals that produce eggs with internal membranes. The first fully terrestrial vertebrates were amniotes. That’s because their eggs lacked a waterproof covering and would dry out on land. However, they still had to return to water to reproduce. \)Īmphibians were the first animals to have true lungs and limbs for life on land.
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