Which organism has a central ganglia in its head connected to a ladder-like arrangements of nerve fibers. a. spider b. seahorse c. frog d. flatworm

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

Which codon is the code for the amino acid histidine (his)?

Name the two stages involved in protein synthesis and explain what occurs in each of the two stages. be sure to also indicate where each process takes place. plz don't give one sentence answers : d