Sunlight
Sunlight is necessary for animals to produce vitamin D, which is involved in bone metabolism and immune function. It also helps regulate body temperature and sleep-wake cycles. Animals that live in areas with little sunlight are at risk for vitamin D deficiency, which can lead to health problems such as osteoporosis and rickets.
Water
Water is essential for all living things. Animals use it to regulate body temperature, transport nutrients and oxygen throughout the body, and remove waste products. Animals also use water to breathe, as it is a component of the respiratory system. Animals that do not get enough water are at risk for dehydration, which can lead to death.
Examples of how animals use sunlight and water:
* Reptiles: Reptiles bask in the sun to absorb heat and regulate their body temperature. They also use water to stay hydrated and to help them shed their skin.
* Birds: Birds need sunlight to help them see and navigate. They also use water to drink, bathe, and build their nests.
* Mammals: Mammals use sunlight to regulate their body temperature and to produce vitamin D. They also use water to drink, bathe, and cool off.
Animals have a variety of adaptations that help them survive in different environments. Some animals, such as camels, are able to store water in their bodies so that they can go long periods of time without drinking. Other animals, such as polar bears, have thick fur that helps them stay warm in cold environments.
Sunlight and water are two essential resources that animals need to survive. Animals have a variety of adaptations that help them obtain these resources.