Final answer:
The distribution and abundance of species in ecosystems are primarily influenced by climate, food availability, and human activities. These factors affect survival, reproduction, and competition for resources within ecosystems, shaping the biodiversity we observe.
Step-by-step explanation:
The three main factors influencing the distribution and abundance of species in ecosystems are climate, food availability, and human activities. Climate determines the environmental conditions under which species can survive and reproduce. Food availability affects the carrying capacity of habitats for different species. Human activities such as habitat destruction, pollution, and climate change drastically alter ecosystems, often to the detriment of biodiversity.
Life in an ecosystem is governed by competition for resources, which is influenced by biotic interactions, such as predation and mutualism, and abiotic factors like temperature, water, and nutrient availability. Highlighting climate, food availability, and human activities helps us understand how populations and communities form and thrive within specific ecological contexts.