1. In a biology experiment the number of yeast cells is determined after 24 hours of growth at different temperatures.
a) Identify the independent and dependent variables in the experiment.

Find the answer in the explanation

Explanation:

Given that In a biology experiment the number of yeast cells is determined after 24 hours of growth at different temperatures

The dependent variable depends on the value of the independent variable.

From the question above,

The independent variable is the temperature

While the dependent variable is the number of yeast cells

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.