1. Efficient use of space
2. Elimination of groundwater contamination
3. Energy generation
4. Lower carbon footprint
The cells of a sporophyte stalk differ from egg and sperm cells because the egg is only created from the cells of the woman plant cells and is given sperm from the man cells. ''The sporophyte is a stalk that grows after haploid sperm cell.
Answer:
a) The mineral Quartz (silicon dioxide SiO2), is created by combining the elements silicon and oxygen.
b) Coal, from plant materials, and limestone (calcium carbonate CaCO3) created by corals and other sea creatures, are not minerals even though they are mined like many ores.
Explanation:
Quartz is a very hard mineral created by combining the elements silicon and oxygen. It is chemically stable and so weathers very slowly. The quartz crystal can be colored yellow, brown, black, milky white, rose, etc depending on the impurities in the rock at the time of formation. It is used in the production of optical instruments, various electrical devices, sandpaper, grinding tools, etc.
Coal is formed from the gradual accumulation of plant remains (peat) that are found in tropical wetlands. It is used as fuel for electric power generation, in blacksmithing purposes and to make coke.
Limestone is made up of skeletal fragments from marine organisms like corals, planktons, coralline algae, sponges, echinoderms, mollusks, foraminifera, etc. The shells of most of these organisms are made up of aragonite or calcite. When they die, the shells left behind are accumulated over millions of years and form limestone. It is used in the production of lime, used as a building material and filler in products like toothpaste or paints. It is also an essential component of Portland cement.
<span> gills, fins, and blood.
The three structures and physical entities that almost all fish have:
Gills
Fins
Blood
Almost all fish have gill slits because there is no other way they can breathe underwater without having gills.Fins are used to move around the water and blood delivers oxygen and nutrients.
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The Correct Answer I Believe is B
The four principles of natural selection are variability among members of a species, heritability of the variable features, differences in population members' ability to reproduce and survival of the fittest in terms of variability, heritability and reproduction. Natural selection is one of evolution's four mechanisms.
