1 Allow the roast to stand at room temperature for one hour. 2  Set the roast on a rack in a roasting pan (fat side up) and put into a 450 degree F preheated oven for 15 minutes (be sure oven is preheated). 3  Turn oven down to 350 degrees F and continue roasting until your meat thermometer reads.
Unicellular protozoa and algae are unicellular eukaryotes. Pluricellular algae are also eukaryotes of simple structure. Protists are believed to be the phylogenetic ancestors of the living organisms of the other eukaryotic kingdoms (fungi, animals and plants).
A homologous structures are structures that share an evolutionary  ancestry. An example of homologous structures would be the bones in  the arms of a human, the wings of a b â¦ at, and the legs of a dog.tructures that are embryologically similar, but have different functions, are called homologous structures. Though these animals look different, a comparison of homologous structures indicates that they are quite similar. This suggests that these animals evolved from a common ancestor.   by: Lameace[=.