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Photosynthesis converts light energy into chemical energy (glucose) in plants, using water and carbon dioxide. Cellular respiration (B) breaks down glucose. Options C and D relate to animal processes. GACE Science objectives emphasize energy transformations and plant processes.

Fine motor skills involve small muscle control, especially hands and fingers. Cutting with scissors develops dexterity. Running, jumping, and kicking are gross motor activities. GACE Health/Arts standards require understanding motor development stages and appropriate activities.

The 26th Amendment (1971) lowered the voting age from 21 to 18, largely due to the Vietnam War. The 15th gave African American men the right to vote, the 19th gave women suffrage, and the 24th banned poll taxes. GACE Social Studies objectives include knowledge of constitutional amendments and civil rights history.

Greece’s mountainous terrain separated populations, leading to independent city-states (like Athens and Sparta). Fertile valleys (A) characterize Mesopotamia and Egypt. Deserts (C) describe regions like Egypt, and forests (D) were less significant. GACE Social Studies emphasizes geography’s role in shaping civilizations.

Step 1: Add 5 to both sides → 7x=217x = 21.

Step 2: Divide by 7 → x=3x = 3.

Wait, correction: 7x−5=167x - 5 = 16.

Add 5 → 7x=217x = 21.

Divide 21 ÷ 7 = 3.

Correct answer is B, not D.

This demonstrates importance of careful calculation. GACE Math requires accuracy in solving linear equations with clear reasoning steps.