A type of small snail is very widespread in japan, and colonies of the snails that are genetically similar have been found very far apart. scientists wondered how the snails could travel such long distances. a recent study1 provides the answer. biologist shinichiro wada fed live snails to birds and found that of the snails were excreted live out the other end. the snails apparently are able to seal their shells shut to keep the digestive fluids from getting in.

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

Choose the correct words to complete the sentences related to genetic screening. is a procedure that is used during pregnancy to detect genetic defects. is extracted from the uterus and used to identify genetic disorders?

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous