Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A phenomenological approach to the evolution of galaxies   Increasingly good statistical data on the galaxy population at high and low
redshift enable the development of new phenomenological approaches to galaxy
evolution based on application of the simplest continuity equations. This has
given new insights into the different ways in which star-formation in galaxies
is quenched, the role of merging in the population, and into the control of
star-formation in star-forming galaxies and the links between this and chemical
evolution, in particular the existence of SFR as a second parameter in the
mass-metallicity relation. The continuity approach provides a self-consistent
view of the evolving population and exposes linkages between different aspects
of galaxy evolution.

8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol