True.
Polar bears evolved from the brown bear. Their fur mutated from dark to adapt to the colder climate and to hide in the snow. Probably, in the past, there were some bears with mutated lighter fur. This trait allowed them to survive so that mutated gene was transmitted to the next generations. Lighter fur allowed them to retain body heat and better to hide during hunting. White bears had a higher fitness than brown bears in the cold climate, so generations later, all polar bears were white.
Phytoplankton are the aquatic producers that form the bottom of aquatic food webs, but their total biomass at any given time is actually very small. They are able to support the higher trophic levels because they grow and reproduce much more quickly than the other organisms in the food web.
At the back of the throat is where the palatine tonsils are
located. One of the tonsils is on the right side of the throat while the other
tonsil is on the left side of the throat. The major roles of the these tonsils
is to protect the body against gastrointestinal and respiratory infections.
Having homologous chromosomes indicates that the organism is a DIPLOID SPECIE.
A homologous chromosome refers to a pair of chromosomes which originate from each parent. Homologous chromosomes posses the same length, banding patterns, amount of genes, location of genes and location of centromeres. However the genes in the homologous chromosomes may or may not be the same.
