Life Cycles in Ecosystems

Introduction to the Science.ec 5 lesson 1 for Unit 6: Life Cycles in Ecosystems

1. Block 6 – Lesson 1 Life cycles in ecosystems

2. What do you see in the picture?

3. FACTS All organisms interact with environmental factors such as: -Water -Air -Soil and -Sunlight These factors are needed for the life cycle: Birth, development, into an adult, reproduction and death.

4. PROBLEMS The life cycle may be interrupted when any change in one part of an ecosystem upsets its balance within the limits of tolerance of organisms . If environmental conditions are extreme, like forest fires, droughts, floods, frost, or accumulation of toxic gases, certain organisms might perish. These problems appear for natural reasons or because of human activities.

5. Living things have their own ways of adapting to external factors that affect their survival. Some migrate to other places and others adjust themselves to the new situation. Human beings face changes with knowledge and technological instruments. For example, they use artificial insemination in cases of infertility. SOLUTIONS