Why do some animals give live birth and some don’t?

Introduction: The Mystery of Live Birth

One of the most fascinating aspects of animal reproduction is the diversity of strategies that different species have developed to produce offspring. While some animals lay eggs, others give birth to live young. The reasons behind this dichotomy are still a mystery to scientists, but researchers have proposed a variety of hypotheses to explain the advantages and disadvantages of live birth. In this article, we will explore the different types of reproduction, the evolutionary history of live birth, the role of parental care, the impact of environmental factors, the genetic basis of live birth, and the diversity of live birth in the animal kingdom.

The Two Types of Reproduction

Reproduction can be divided into two main types: sexual and asexual. Sexual reproduction involves the fusion of two gametes (sperm and egg) to form a zygote, which develops into an embryo. Asexual reproduction, on the other hand, does not involve the fusion of gametes and results in offspring that are genetically identical to the parent. In animals, asexual reproduction is rare and limited to some invertebrates such as starfish, jellyfish, and some species of worms. Sexual reproduction, on the other hand, is the norm for most animals, and can take different forms depending on the species. Some animals lay eggs, which are fertilized externally or internally, while others give birth to live young.

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