The T-cell receptor link to MHC–peptide is enhanced by interaction between MHC class II on the antigen-presenting cells with the following molecule on the T-cell:

#Question id: 5017

#SCPH06 I Botany

Arrange these events from earliest to most recent.

1.  emission of lava in what is now Siberia at time of Permian extinctions

2.  emission of lava that solidified at the same time as iron-bearing terrestrial rocks began to rust

3.  emission of lava that solidified at the same time as rusted iron precipitated from seawater

4.  emission of lava in what is now India at time of Cretaceous extinctions

#Question id: 5017

#SCPH28 | Zoology

Arrange these events from earliest to most recent.

1.  emission of lava in what is now Siberia at time of Permian extinctions

2.  emission of lava that solidified at the same time as iron-bearing terrestrial rocks began to rust

3.  emission of lava that solidified at the same time as rusted iron precipitated from seawater

4.  emission of lava in what is now India at time of Cretaceous extinctions

#Question id: 5018

#SCPH06 I Botany

Which event is nearest in time to the end of the period known as snowball Earth?

#Question id: 5018

#SCPH28 | Zoology

Which event is nearest in time to the end of the period known as snowball Earth?

#Question id: 5019

#SCPH06 I Botany

A major evolutionary episode that corresponds in time most closely with the formation of Pangaea was the

#Question id: 5019

#SCPH28 | Zoology

A major evolutionary episode that corresponds in time most closely with the formation of Pangaea was the