A grapefruit
what is a large yellow sour fruit
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The tree that has large thorns and yellow, fuzzy fruit is called the Poncirus trifoliata. The species was introduced from China.
A spider that is brown with a large yellow belly might be a brown widow. Almost all spiders roll into a ball for protection. This spider could also be a garden orb.
A shaddock, alternatively known as a pomelo, is a large yellow citrus fruit native to southeastern Asia, or the tree which produces said fruit.
A large brown bird of prey, with white head and tail, large yellow bill.
Ultimately the color will still be a shade of brown, because brown is any color with all 3 primary colors in it. Depending on the brown you start with, the resulting color could be very green or very orange. If you add a large amount of yellow, the result may be a very mucky yellow.
A wasp or hornet that is very large with a black bottom with 4 yellow stripes and a possible brown top could describe more than one type of wasp. It could be Digger wasps, or yellow jacket wasps.
An example of a multiple fruit would be the pineapple. The pineapple grows in tropical regions where it is warm most or all of the year. The pineapple is a single fruit that comes from more than one flower(and therefor more than one pistil) and the ovaries of each flower fuses so produce the large fruit.
Zoolanthellae is a substance that is present in large numbers in the cytoplasm of most marine invertebrates. It typically ranges in color from yellow to brown.
To a large degree, it is the ascorbic acid (vitamin C). This is the main ingredient in products such as fruit fresh. To a lesser degree, citric acid.
An apricot is a variety of sweet and juicy fruit with a stone, with yellow-orange coloured flesh, fuzzy skin, and a large seed, or the tree from which it derives.