combining code of multiple sensors in one program

I need to operate 2 different sensors (gas and temp) simultaneously. I have managed to run each one of them separately and I don't know how to manipulate the code so they could work together. My background in coding is basic and I'm not the one who wrote these codes. these are the codes:

Thermistor code:

void setup() {            //This function gets called when the Arduino starts
  Serial.begin(9600);   //This code sets up the Serial port at 9600 baud rate
}

void loop() {             //This function loops while the arduino is powered
  int val;                //Create an integer variable
  val=analogRead(0);      //Read the analog port 0 and store the value in val
  Serial.println(val);    //Print the value to the serial port
  delay(1000);            //Wait one second before we do it again
}

This is the gas detector code:

/* GAS Sensor MQ-2
This sensor detects flammable gasses
the board has four pins
connect AO to Arduino pin A0
connect DO to Arduino pin 2
connect Gnd to Arduino Gnd
connect Vcc to Arduino 5 volts
*/

int sensorPin = A0; // select the input pin for the potentiometer
int DOPin = 2; // select the pin for the LED
int sensorValue = 0; // variable to store the value coming from the sensor
int ledPin =13;


void setup() {
 // declare the ledPin as an OUTPUT:
 pinMode(DOPin, INPUT);
 pinMode(ledPin, OUTPUT);
 Serial.begin(9600);
 }


void loop() {
 // read the value from the sensor:
 sensorValue = analogRead(sensorPin);
 Serial.print("Analog Output = ");
 Serial.println(sensorValue);
 // turn the ledPin on if triggered
 //
 if (digitalRead(DOPin) ==HIGH){
 digitalWrite(ledPin, LOW);
 Serial.println("Digital Output = OFF");
 }
   else {
     digitalWrite(ledPin, HIGH);
     Serial.println("Digital Output = ON");
  }
  delay(1000);
}