This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: During which time period were dinosaurs most abundant?[br][br][b][color=black]Question ... (Read 29 times)

sjones

  • Hero Member
  • *****
  • Posts: 520
on: Jul 18, 2018
During which time period were dinosaurs most abundant?

Question 2

Why werent plants the first form of life to appear on earth?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

bubulittle310@msn.cn

  • Sr. Member
  • ****
  • Posts: 281
Reply #1 on: Jul 18, 2018
Answer to Question 1

Dinosaurs were most abundant during the Jurassic period, 180135 million years ago.

Answer to Question 2

Some 2.2 billion years ago, free oxygen was present in the atmosphere. Living things used this reactive substance,
not decaying plant material, in biochemical functions of their cells. The free oxygen in the atmosphere also
produced a layer of ozone, which filters out the ultraviolet light from the sun that is harmful to life.


sjones

  • Hero Member
  • *****
  • Posts: 520
Reply #2 on: Jul 18, 2018
TY


bubulittle310@msn.cn

  • Sr. Member
  • ****
  • Posts: 281
Reply #3 on: Jul 18, 2018
Happy to Help


« previous next »
 

Did you know?

After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.

Did you know?

In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

Did you know?

Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

A color-enhanced scanning electron micrograph of a neuron cell body (grey) studded with terminal ... A color-enhanced scanning electron micrograph of a neuron cell body (grey) studded with terminal ...
Embryonic Period Embryonic Period
Embryonic Period Embryonic Period
Hardy-Weinberg Question P3 Hardy-Weinberg Question P3
economic question economic question
Morgan’s analysis of genetic linkage of X-linked genes for eye color Morgan’s analysis of genetic linkage of X-linked genes for eye color
Video: Stages of Mitosis - Prophase, Prometaphase, Metaphase, Anaphase & Telophase

For a complete list of videos, visit our video library