The Scientific Method

Clues in this puzzle

Across

• Substance with a pH strictly below seven (4)
• Oscillating disturbance that transfers energy through space (4)
• Biological catalyst that accelerates metabolic reactions (6)
• Optical instrument built to magnify distant celestial targets (9)
• Hereditary sequence written in DNA (4)
• Fundamental quantum packet of light (6)
• Single-celled microscopic organisms lacking a membrane-bound nucleus (8)

Down

• Attractive natural phenomenon drawing massive bodies toward each other (7)
• Charged particle that lost or gained an electron (3)
• Interstellar cloud of dust and gas where infant stars form (6)
• Microscopic gap across which neural impulses communicate (7)
• Smallest unit capable of independent life (4)
• Elemental variant having a different neutron count in its core (7)
• Curved piece of glass that refracts rays to a focus (4)

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