Nutrient availability refers to the accessibility of essential nutrients in the environment for organisms, particularly plants. Factors such as soil composition, pH levels, and moisture influence how well nutrients like nitrogen, phosphorus, and potassium can be absorbed. Healthy soil promotes better nutrient availability, which is crucial for plant growth and agricultural productivity. In ecosystems, nutrient availability affects food chains and biodiversity. For example, when nutrients are abundant, plants can thrive, supporting herbivores and, in turn, carnivores. Conversely, nutrient deficiencies can lead to poor plant health, impacting the entire ecosystem, including species like deer and birds that rely on plants for food.