Question

11 multiple choice 2 points according to the interpretation of the fossil record by many scientists, during which time interval shown on the accompanying time line did increasingly complex multicellular organisms appear on earth? time line a b c d e 5.0 4.0 3.0 2.0 1.0 present billions of years ago a to b b to c c to d d to e 12 multiple choice 2 points one explanation for the variety of organisms present on earth today is that over time new species have adapted to fill available niches in the environment evolution has caused the appearance of organisms that are similar to each other each niche has changed to support a certain variety of organism the environment has remained unchanged, causing rapid evolution

Explanation:

For question 11:

• Multicellular organisms started to appear in significant numbers around 1 - 2 billion years ago.
• The time interval from \(C\) (3.0 billion years ago) to \(D\) (1.0 billion years ago) is the relevant range.

For question 12:

• According to the theory of evolution, new species adapt to fill available ecological niches, which leads to the variety of organisms.
• Option 1 is in line with the principle of natural selection and adaptation.

Answer:

1. C. \(C\) to \(D\)
2. new species have adapted to fill available niches in the environment