Why do many invertebrates die during the earlier stages of life?

Many invertebrates face high mortality rates during their early life stages due to factors such as predation, environmental stress, and competition for resources. Their small size and vulnerability make them easy targets for predators, while harsh conditions like temperature fluctuations and pollution can impact survival. Additionally, limited food availability and competition with other organisms can further reduce their chances of reaching maturity. These challenges result in a natural selection process that favors those individuals that can survive and thrive despite the odds.