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We also know that venomous snakes have co-opted many proteins for their venoms that are already used elsewhere in the body . When the muscles relax , the cavity decreases in size and exchange of gases with the blood in the roof vessels is facilitated by the increase of pressure of the contained air . Loans guaranteed or insured by the Federal Government are in default when the borrower breaches the loan agreement with the private sector lender . Accounting for Direct Loans and Loan Guarantees , states that because credit programs provide interest subsidies and sustain losses caused by defaults , the costs of these programs are significant . He checked the area for snails and eggs but all he found was a small mucilaginous mess where the snails had copulated .