Hello help pls A glass of juice at 20°C was kept in the open. After 30 minutes, the temperature of the juice remained the same. Which statement is correct? The temperature of the surrounding air was greater than 20 °C. The temperature of the surrounding air was less than 20 °C. The temperature of the juice was equal to the temperature of the surrounding air. The temperature of the juice was less than the final temperature of the surrounding air.​

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.