Which statement best describes the current scientific view of birds? a) a group of feathered, ectothermic lizards that lack teeth b) a group of flying mammals that are derived from monotremes, which also lay amniotic eggs c) a group of flying, endothermic reptiles that have lost teeth, the amniotic egg, and other heavy body features as an adaptation for flight d) a group of feathered, endothermic dinosaurs

D) a group of feathered, endothermic dinosaurs

Explanation:

Birds are a group of endothermic  dinosaurs, characterized by feathers, epidermal structures that form plumage. Warm-blooded animal species (endothermic) maintain the body temperature higher than their environment.

Answer A is false because although birds are feathered and lack teeth, they are NOT ectothermic lizards.

Answer B is false because although birds lay amniotiv eggs, birds are a different taxonomic group than mammals, and not all birds fly.

Answer C is false because although  some reptiles are closely related to birds, the current scientific consensus is that birds are a group of dinosaurs. Also, not all birds fly, and although they have lost the teeth, they  have NOT lost the amniotic egg.

spiders belong to a group of arachnids.

arachnids have the following traits :

they have two body parts.

they have eight legs unlike insects which have 6 legs.

they have no wings.

these traits distinguish them from insects.

the information that antonio is doubting us the statement that spiders differences are as a result of being first to evolve.

this is because the evolution of one species is independent of the other species.

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]