A mixture of oxygen, nitrogen, and hydrogen gases exerts a total pressure of 74 kPa. The partial pressure of the oxygen is 21 kPa and the partial pressure of the nitrogen is 45 kPa. What is the partial pressure of the hydrogen gas in this mixture? (1 sig fig)

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

Pls! plant cells and animal cells were observed under a microscope. the characteristics of two cells are listed below. cell p: does not capture sunlight cell q: has cytoplasm but no chloroplast which statement about the two cells is correct? cell q also has a cell wall. cell q also has large vacuole. cell p also has a large vacuole. cell p also has a cell membrane.