(there are 5 questions ) question 1 what is one difference between a cell wall and cell membrane? a) cell walls do not connect cell to cell. cell membranes only connect cell to cell b) cell walls contain vesicles. cell membranes contain plasmids c) only plant cells have cell walls. only animals have cell membranes d) the cell wall is a rigid structure. the cell membrane is flexible question 2 what structural feature of cells can allow molecules to flow directly from the inside of one cell to the inside of the next? a) plasmids b) chloroplasts c) cilia d) plasmodesmata question 3 when non-nerve cells become involved in response to signals, which type of receptor goes into action? a) endomembrane receptor b) ion channel linked receptor c) intracellular receptor d) enzyme linked receptor question 4 which is not an example of intercellular communication? a) control of cell division b) molecule in a cell changes function of cell c) molecular movement within a cell d) reaction to pheromones question 5 which is not an example of intercellular communication? a) a molecule stimulates a target cell via a receptor b) a message is distributed across plasma membrane c) an electrical signal cause muscle cells to contract together d) a message travels between gap junctions

this website is for anybody really not just for girls just saying, also while a lot of males are mean and you know there are the few who are kind and then there's the nice-guys but then theirs also guys like me who are shy we don't get out much because there are people like you who exist who would most likely punch a guy in the face so next time just think about things before you post them to a website where guys and girls can see your question.

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]

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