Canaliculi are tiny canals in bone between osteocytes containing osteocyte cell processes. A spongy bone, also known as a cancellous bone, is a bone with latticelike appearance. A compact bone is a bone that is denser and has fewer spaces than cancellous bone. A compact bone has canaliculi but the spongy bone doesn't, because compact bone tissues form the outer layer of the bone while the cancellous bone tissues form the inner layer of the bone and it does not have osteons. Anosteon is a single central canal, with its contents, and the associated lamellae and osteocytes surrounding it.
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DNA replication is called semi-conservative because half of the original double-helix appears in one daughter strand formed in replication if you need any more help then please comment and let me know ok. :)
Are there any statements given for this assignment? Because according to what I know, alligators and crocodiles are more related to birds because of archosaurian origins. However, crocodiles are more closely related to birds than snakes because the evolution of birds from having snouts to beaks are slightly evident in crocodiles for they have more pointly snouts.