Answer:
Gymnosperms and lower vascular plants have sieve cells as their sieve elements, while sieve tubes are characteristic of flowering plants angiosperms. In gymnosperms, typical companion cells are lacking in the phloem. In gymnosperms, generally the xylem contains only tracheids. Vessels are absent.
Explanation:
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Answer:
Coastline has lots of beaches and is an area for breeding for many sea animals.
Explanation:
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I think it is true not 100% sure but i believe it is true <span />
Answer:
RR x rr / Rr x RR
Explanation:
For all of the first final generation to all produce round peas, it means the parents crossed were pure breeds of both dominant and recessive genotype or one of the the parents is an heterozygote and the other is a pure breed dominant. The resulting peas will have a phenotype which is the observed round shape but their genotype may be either the homozygous RR or the heterozygous Rr.
Answer:
Virulence, the capacity to cause disease, varies markedly among viruses. Some viruses cause lethal disease while others do not. For example, nearly all humans infected with rabies virus develop a disease of the central nervous system which ultimately leads to death. In contrast, most humans are infected with circoviruses with no apparent consequence.
Explanation: One explanation for viral virulence is that it facilitates transmission. However, a comparison of infections caused by two enteric viruses, poliovirus and norovirus, does not support this general view. Both viruses infect the gastrointestinal tract and are spread efficiently among humans by fecal contamination.
