What component of Earth's atmosphere exists entirely as a result of photosynthesis? A. oxygen gas, B. water vapor, C. nitrogen gas, D. carbon dioxide gas​

Which of these is the most likely consequence of falling petroleum price

The large ground finch obtains food by cracking seeds. what is its short, strong beak an example? a) tendency toward perfection b) adaptation of a species over time c) selective use and disuse of an organ over time d) scarcity of recourses

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.