Small differences between parents and their offspring can accumulate so descendants can be very different from their ancestors. In sexual reproduction, females produce eggs and males produce sperm. All organisms must be able to obtain and use resources, grow, reproduce, and maintain stable internal conditions while living in a constantly changing external environment. Organisms And Their Environment Energy from the sun is passed through food webs in an ecosystem. Environments support a diversity of plants and animals that share limited natural resources.
Human activities affect ecosystems.
These grade level performance standards are listed developmentally. However, each school is uniquely organized. Disease in organisms results from a failure in structures and functions or damage by infection. All organisms including plants and animals are classified by their characteristics. All organisms depend on each other.