Answer:
The population of fish with pelvic spines that arrived in the lake at time B evolved a reduced pelvis over time (beginning at time C).
(Having a reduced pelvis must have been advantageous for this ancient stickleback population, just as it is for many current freshwater stickleback populations.)
<span>What moves across axons? A. Ions
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Accretion is a process by which material is added to a tectonic plate or a landmass. This material may be sediment, volcanic arcs, seamounts or other igneous features. There are two types of geologic accretion—plate accretion and landmass accretion. The Plate accretion involves the addition of material to a tectonic plate. The Landmass accretion involves the addition of sediment to a coastline or riverbank, increasing land area.
The virulence of the microbes should be high to cause an active infection.
Explanation:
Virulence is the actual potential or ability of a pathogenic microbe to infect a host. Even with a high median infectious dose to cause an infection, it is the virulence which defines the level of pathogenicity or ability of the pathogens like the foodborne pathogens to cause and active infection.
An active infection is caused when virulence of the pathogen is high. The virulence factors are surface receptors, surface coats, and toxins.
Virulent bacteria cause active infection by adhesion, colonization, invasion, immune response inhibitors, or as toxins. A virulent virus replicates rapidly and modifies the host’s defensive mechanism
