38. A student wants to test the hypothesis that catalysts speed up chemical reactions. She decides to use beef liver since she knows that the liver contains catalysts that speed up chemical reactions in mammals. She sets up her reaction tubes as follows: test tube 1 has the
reaction chemicals and no liver. Test tube 2 has liver but no reaction chemicals. Test tube 3 has the reaction chemicals and a small piece
of liver. She observes the following: (1 point)
Test Tube 1 Small gas bubbles form
Test Tube 2
No reaction
Test Tube 3 Vigorous bubbling, test tube hot

Which of the rock examples below is most likely to be metamorphic

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?

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