I learnt in biology that the annelids were the first animals on earth that developed segmentation. By that, we mean that an organism can develop different parts of the body to have different functions. For example, sensory organs can develop in the front segment. Organs that help with gathering food can develop around the mouth.
Seeds are dispersed by wind, and are often constructed to do that well, for example by having thin membranes attached to them (or feather-like structures) that float easily and far in the wind. Some seeds are eaten by birds and are not easily digested by them, so that when the bird drops its fecal pellet, … Read more
Do you mean frog's eggs? They are little black spots inside a clear jelly-like coat. When they are laid by the female frog, there are usually a large number of them and they all stick together in a large mass. It looks like a blob of jelly with lots of little black spots inside it.
The 3 groups of mammal are classified by the differences in their reproductive characteristics. For example; (platypus and echidna) have a single urogenital opening and give birth to their young inside an egg. At the moment of birth, the young are already partly developed but still inside the shell. Metatheria (the marsupials) also have a … Read more