Which of the following is a trace fossil?
A-a fossilized dinosaur nest
B-a mosquito trapped in amber
C-a mummified plant seed
D-a frozen woolly mammoth

The sketch shows a rynchosaur, an extinct animal that is known only from fossils. there has been much debate about the classification of these creatures. some scientists suggest that they belong with primitive amphibians, and some think they are related to snakes and lizards. the data equally support both cases. which statement best explains how to draw a cladogram that includes the rynchosaur? draw the cladogram for amphibians. draw the cladogram for reptiles. draw two cladograms, both showing the traits, and leave it as a hypothesis. draw two cladograms, both showing the traits, and have scientists vote

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.

Vessels draining the myocardium of the heart, open primarily ,into which chamber?