frog blastula

amphibian animal animals anuran batrachian biology bladder blastodermic blastula brandybottle brown caviar cell closeup common development duplication egg eggs environment extreme focus frog frogs gelatinous germ grass horse ice inside laid little macro melted mesembryo metamorphosis nail nasty nature north oocyte ootid ovule ovum paddling pollywog pond pool rana replication reproduction reptile semiaquatic shell soft spawn stage temporaria terraqueous true vesicle vesicular wildlife