Question

1. dna evidence

• the definition of being related to someone is sharing ____________, or hereditary material.
• the video states that the strongest and ____________ evidence for common ancestry is the dna that all life on earth shares.
• the more __________ two organisms have in common, the more closely they are considered __________.
• even complex organisms, like humans, share genes for basic cell functions with simple life forms, like ____________.

1. the fossil record

• the __________ ________ is our greatest source of evidence for evolution because it shows that species from the past were very __________ than they are today.
• the fossil record is considered ____________ because we only have fossils for a fraction of species that have existed.
• to determine the age of fossils, scientists analyze structural evidence and use ____________ evidence.
• new fossil evidence led scientists to conclude that the closest living relative of dinosaurs are ____________, not reptiles.

Explanation:

3. DNA Evidence

• The definition of being related to someone is sharing DNA, or hereditary material. (DNA is the hereditary material that is shared among related individuals.)
• The video states that the strongest and most compelling evidence for common ancestry is the DNA that all life on Earth shares. (DNA evidence is strong and compelling as all life shares it, indicating common ancestry.)
• The more DNA (or genes) two organisms have in common, the more closely they are considered related. (Genetic similarity (shared DNA/genes) is a measure of relatedness in evolutionary terms.)
• Even complex organisms, like humans, share genes for basic cell functions with simple life forms, like bacteria (or archaea, or single - celled organisms). (Simple life forms like bacteria have basic cell functions, and their genes for these functions are conserved in more complex organisms.)

4. The Fossil Record

• The fossil record is our greatest source of evidence for evolution because it shows that species from the past were very different than they are today. (The fossil record preserves the remains of past species, and by comparing them to modern species, we can see how they have changed over time, i.e., evolved.)
• The fossil record is considered incomplete because we only have fossils for a fraction of species that have existed. (Most organisms do not fossilize, so we only have fossils for a small portion of all the species that have ever lived.)
• To determine the age of fossils, scientists analyze structural evidence and use radiometric (or dating) evidence. (Radiometric dating techniques, like carbon - dating for relatively recent fossils or uranium - lead dating for older fossils, are used to determine the age of fossils.)
• New fossil evidence led scientists to conclude that the closest living relative of dinosaurs are birds, not reptiles. (Fossil evidence, like the discovery of feathered dinosaurs and the anatomical similarities between dinosaurs and birds, has shown that birds are the closest living relatives of dinosaurs.)

Answer:

s (filling in the blanks):

1. DNA Evidence:

• DNA
• most compelling
• DNA (or genes); related
• bacteria (or archaea, or single - celled organisms)

1. The Fossil Record:

• fossil record
• different
• incomplete
• radiometric (or dating)
• birds