The KT boundary marks a mass extinction event. the KT boundary is the time between the Cretaceous and Tertiary periods. An asteroid hit the earth at the end of the Cretaceous and that caused the end of the Cretaceous period. Before the KT boundary, pollen from angiosperms and gymnosperms is high. After the meteor hits the earth, a mass extinction occurs and the amount of pollen from gymnosperms and angiosperms decreases dramatically, while the amount of spores from ferns increases. During the Cretaceous period there were many species of gymnosperms and angiosperms but they disappeared at the KT boundary, when the asteroid hit the earth.
<span>A solution is hypertonic to a cell if it has a higher solute (dissolved substance) concentration than the cell does. As a result, it also has a lower concentration of water than the cell does. Cell membranes and plant cell walls are semipermeable barriers, which means that certain molecules can diffuse through them, while other molecules can not.</span>
Answer:
All the Robins in Austin Texas
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Please double check! I might be incorrect.
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Heat<span> can be </span>transferred<span> from one place to another by</span>three methods<span>: conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass</span>
Answer:
There are two alleles, the recessive yellow allele and the dominant brown allele. The female is hom0zygous recessive while the male is heterozygous, this means that half of their children will be hom0zygous recessive and be yellow. The other half will be brown and heterozygous, meaning they have a yellow allele and a brown allele. If the female mated with a hom0zygous dominant male, then all of their offspring will end up being heterozygous and brown.
