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.
Answer:
Radioactive waste, which can be very bad for humans and cause cancer.
Must be passed from parent to offspring to have an effect on evolution of a species. give brainliest x
Answer:
The nucleus contains "the cell's genetic material, DNA." DNA makes protein molecules to help with almost every cellular process
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Answer:
phenotype
Explanation:
the phenotype of an organism is its appearance, or physical name.(like the type of trait or colour)
the genotype is its genetic makeup, for example Tt or TT.
