Question

exit ticket – u4.l4: relative dating
directions: answer the following questions based on your knowledge of science

1. the first life on earth ______.

a. had cells with nuclei and evolved 1,800 million years ago
b. had cells with nuclei and evolved 3,500 million years ago
c. had cells without nuclei and evolved 1,800 million years ago
d. had cells without nuclei and evolved 3,500 million years ago

1. put the following organisms in order, based on when they evolved: humans, water plants, prokaryotes, amphibians, land plants

time
____ __ __ __ ____

Explanation:

Question 1

The first life on Earth were prokaryotes (cells without nuclei) that evolved around 3.5 billion (3,500 million) years ago. Option a and b are incorrect as first life had no nuclei. Option c has wrong time. So d is correct.

The evolutionary timeline: Prokaryotes (first life) → Water plants (aquatic photosynthetic) → Land Plants (moved to land) → Amphibians (transition to land from water) → Humans (most recent, mammals). So order from earliest to latest (left to right on time arrow) is Prokaryotes, Water plants, Land Plants, Amphibians, Humans.

Answer:

d. had cells without nuclei and evolved 3,500 million years ago

Question 2