4. Use evidence from the scientific investigation to develop descriptions,
explanations, generalizations, predictions, and models.
5. Think critically and logically to develop and communicate the relationship among
the variables of the scientific investigation.
Standard#2:Students demonstrate knowledge ofproperties,.(orms, changes and
interactions of physical and chemical systems.

Competencies:

1. Classify matter based on common physical properties.
2. Explain the transfer of energy in food chains and pyramids, including the
Iconcepts of photosynthesis and respiration. '
3. Identify the changes of state (solid, liquid, gas) in the water cycle. .-
4. Explain how photosynthesis and respiration are chemical reactions that form new
substances.

Standard#3:Students demonstrate knowledge of characteristics, structures and function
of living things, the process and diversity of life, and how living organisms interact with
each other and their environment.

Competencies:

1. Compare structure and function of cells (plant, animal, bacteria).
2. Explain how organisms and systems within organisms obtain and use energy
resources to maintain life processes: growth, reproduction, response to stimuli,
metabolism.
3. Compare the relationships of food webs in a variety of local ecosystems.
4. Describe the differences in the reproductive process, using the principles of
genetics, in a variety of plants and animals.
5. Recognize the basis for standard classification schemes by grouping plants and
animal according to their characteristics: design and use a dichotomous key.
6. Explain the interdependent nature of biological systems in the environment and
explain how they are affected by human interaction: such as life cycles, food
webs, etc.

Standard#4:Students demonstrate knowledge of the composition, structures, processes
and interactions of Earth's systems and other objects in .space.

Competencies:

1. Explain scientific theories about the origin of the Earth, describing how fossils are
used as evidence of life and environmental changes over time.