Question 4 in order to obtain energy, plants must do what? a- consume food b- produce food c- make new cells d- release seeds question 6 how does a penguin increase the chance of the survival of its species? a- it lays one egg. b- it lays thousands of eggs c- it nutures its young d- it splits into two. question 7 which of these is not a basic need of all organisms? a- food b- soil c- water d- appropriate enviornment question 8 what do all living things not need? a- energy b- a place to live c- water d- parents question 13 how does the human body maintain itself during exercise? a- it releases sweat to heat up. b- it releases sweat to cool down. c- it absorbs sweat to heat up. d- it absorbs sweat to cool down. question 15 taxonomy is the study of what? a- plants b- composition of organisms c- classification of organism d- genes question 17 what is a dichotomous key used for? a- creating organisms b- classifying organisms c- naming organisms d- finding organisms question 23 the backbone of sugar molecules is a- sulfur b- oxygen c- carbon d- nitrogen question 24 the four fundamental types of organic molecules are nucleic acids, proteins, carbohydrates, and a- lipids b- nitrates c- sulfates d- phosphates

a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]