Which of the following best describes what alveoli are?

a. they are the smallest tubes in the respiratory system.

b. they have a small amount of surface area.

c. they are found on the end of bronchioles.

d. they are compromised of millions of cells.

As , plants meet their needs for making food from air, soil, water, and the sun's energy in a process called there are plants called grow high in trees without here are words to put in the blanks. 1.) producers 2.) consumers 3.) chloroplasts 4.) epiphytes

Asmall number of finches are removed randomly from the wild and placed in a protected bird area. they are given as much food as they need and have plenty of space. why would natural selection not occur in this population? a. there is no reason for genetic mutation to occur. b. the birds compete for limited resources, c. the population has not reached carrying capacity. d. there is no genetic variation in the finches.

What causes temperature extremes in the desert