Question 7
Select the best description of adaptations, below.

a. The process of breeding only livestock or crops with desirable characteristics to increase the frequency of those characteristics in the offspring

b. A nonrandom mechanism of evolution in which the fittest organisms survive and leave the most offspring

c. The idea that all organisms share an ancient common ancestor

d. An inherited modification of structure or function that allows an organism to survive and reproduce in its environment

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.