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In order to make the most accurate calendar, the following system was devised. Leap years occur every 4 years (for years that are a multiple of 4) except for years ending in 00, for example, 2000. Which of the following years is a leap year? 1898 , 1967 , 1858 , 1872 , 1400
Carbon Dioxide
A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air and is absorbed by plants in photosynthesis.
Life on Earth
The collective existence of all organisms, both past and present, that inhabit our planet, adapting and evolving over billions of years.
Gravity
A fundamental force of nature that causes all things with mass or energy to be attracted to one another, keeping planets in orbit around stars and forming the structure of the universe.
One-Way Flow
A system or process in which resources or materials move in a single direction without recirculation or return to the starting point.
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