Please In an experiment or investigation, what is a control? (1 point)
O The variable that changes other variables in the experiment.
O The variable that remains unchanged throughout the investigation.
O The variable that the experimenter controls or changes

Why would a scientist most likely chose to perform a simulation instead of a lab experiment or field
observation? (1 point)
O Field observations are less accurate than computer simulations.
O The lab experiment might be dangerous or too difficult to do.
O Simulations are more accurate than lab work.
O Simulations rely on mathematics analyze and have one correct answer

What are the four types of terrains that the Water Erosion simulation explored? (1 point)
o rocky, glacial mountain, near water body, and desert
o rocky, glacial mountain, hills and plains, and desert
o rocky, glacial mountain, hills and plains, and near water body
o glacial mountain, hills and plains, near water body, and desert

Which river channel results from a high-gradient, high-volume river flow? (1 point)
O straight with a wide channel
O sediment transportation and gradual bifurcation of the river
O narrow, meandering channel
shallow with a braided channel

Which effect does temperature have on the glacial mountain terrain? (1 point)
O Low temperatures increase erosion by creating more glaciers.
O High temperatures melt glaciers faster and cause erosion to decrease.
O Temperature has no effect on glacial mountains.
O High temperature melts glaciers

answer; i believe that the best answer is (secondary cardiac arrest due to

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation:

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]