Andere Kunden interessierten sich auch für
The vast majority of animals are invertebrates, and all of them have different life cycles. Some of them hatch from eggs and become adults immediately, while others undergo a larval stage and then emerge as adults. Invertebrates are classified into three major groups: insects, arachnids, and crustaceans. While these three groups have some similarities, the main differences are in their physical features. For instance, invertebrates are characterized by a circular body plan, which means that they lack a backbone. Many of them also have a hard, outer covering that serves multiple functions, including supporting muscles and preventing water from evaporating.