Question

1. to what does \descent with modification\ refer?

some species come from preexisting species and are changed over time.
some species come from preexisting species but stay basically the same.
all species come from preexisting species but stay basically the same.
all species come from preexisting species and are changed over time.

Explanation:

"Descent with modification" is a key concept in evolution, stating that all species descend from preexisting species and undergo changes (adaptations, genetic changes) over time. Let's analyze each option:

• First option: Says "some species" instead of "all", which is incorrect.
• Second option: Claims species "stay basically the same", which contradicts the idea of modification (change over time).
• Third option: Also claims species stay the same, which is wrong.
• Fourth option: Correctly states all species come from preexisting species and are changed over time, matching the concept of descent with modification.

Answer:

D. All species come from preexisting species and are changed over time. (Note: Assuming the options are labeled A, B, C, D in order, with the fourth option being D. If the original labeling is different, adjust the identifier but keep the text. From the given options, the fourth one is the correct description of descent with modification.)