What do all mollusks have in addition to a muscular foot and a mantle?

The answer is the radula. This is an structure found in all mollusks except for bivalves (clams, mussel etc. ). It is used for feeding, and can be compared to a tongue. The radula has minute teeth, and is made from chitin. This structure allows mollusks to scrape or cut food before food enters the esophagus. 

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.