Which of the life cycles is typical for animals?

The life cycle of an organism refers to the sequence of developmental stages that it passes through on its way to adulthood. Mammals, reptiles, amphibians, birds, fish, insects and other invertebrates--they each have their own unique way of reproducing life. There is an amazing variety of life cycles within the animal world. read more

A) The sporophyte's chromosome number per cell is 10 and the gametophyte's is 5. read more

Surprisingly, only about 3% of all animal species give birth to live young as part of their life cycle. Most animals lay eggs. Animals need to eat, to grow, to be safe, and to reproduce. This is all part of the life cycle. read more

Life-cycles vary in time depending on the species of animal, and can be as short as just a few weeks for insects, to up to 200 years for sea urchins. Despite the time differences, all animal cycles begin with the growth and development process, which is then followed by reproduction. read more