Science Worksheets and Study Guides Eighth Grade. Respiration and excretion

The resources above correspond to the standards listed below:

New York Standards

NY.6. Interconnectedness: Common Themes: Students will understand the relationships and common themes that connect mathematics, science, and technology and apply the themes to these and other areas of learning.
6.4: Equilibrium is a state of stability due either to a lack of change (static equilibrium) or a balance between opposing forces (dynamic equilibrium).
6.4.1. Describe how feedback mechanisms are used in both designed and natural systems to keep changes within desired limits.
6.4.2. Describe changes within equilibrium cycles in terms of frequency or cycle length and determine the highest and lowest values and when they occur.
NY.L4. The Living Environment: Students will understand and apply scientific concepts, principles, and theories pertaining to the physical setting and living environment and recognize the historical development of ideas in science.
L4.5: Organisms maintain a dynamic equilibrium that sustains life.
4.5.1. Compare the way a variety of living specimens carry out basic life functions and maintain dynamic equilibrium.