Answer:
When first used in medicine in the 1940s, penicillin was uniformly effective in killing the bacterium Staphylococcus aureus. Today, the <u>Darwinian selection</u> has led to an increase in antibiotic-resistant alleles, and humans are increasingly at risk from untreatable Staphylococcus aureus infections.
Explanation:
Those bacterias which were affected by the penicillin were filtered off from the environment since the offspring of those susceptible bacterias were decrease by time until total extinction.
But by the natural mutation of bacterias, some bacterias can originate a offspring of bacterias which were capable of resist the action of an antibiotic. Those genes could also be carried out by a plasmid conjugation creating new colonies which are resistant to the penicillin.
Hypotonic (assuming that the solution on the outside is the same solution on the inside)
<span>Natural wetlands are flat and often have deep, nutrient rich soil with an abundant water supply. These conditions are ideal to agriculture</span>
They have XY genes whilw women have XX. Because the male's two chromosomes are different there is a higher chance of both X AND Y related diseases
Answer:
Most prokaryotes lack well defined organelles.
Explanation:
Prokaryotes are the unicellular organisms which have no true nucleus while eukaryotes have true nucleus. True nucleus means that the membrane is present around the nucleus and other organelles. Many organelles are also absent in prokaryotic cell such as mitochondria, cell wall, golgi bodies, endoplasmic reticulum, lysosomes, ribosome and vacuole.