Blood functions as part of the system and the system. circulatory; excretory
digestive; musculoskeletal
endocrine; respiratory
immune; reproductive

Nucleic acids offer variability because they contain alternate forms of genes called .

Based on the number of offspring they produce at one time organisms are classified into two categories many offspring at once and a few at a time sort the carry sticks based on the category they describe

Question 17 (1 point) where does penicillin come from? a. it is a chemical that man invented b. it is a fungus c. it is a toxin made by other bacteria d. it was discovered in archaebacteria