Which of the following statements about antibodies is correct?
a. antibodies are polypeptides.
b. antibodies are produced by the bone marrow.
c. antibodies are pathogenic foreign substances.
d. antibodies kill bacteria but not viruses.

Choose the molecule that is described by each phrase. energy used during long activities:

Which entry is in the wrong position in the table?

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent