1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
zheka24 [161]
4 years ago
12

What is the predominant hypothesis for why animals only appeared in the fossil record about 3 billion years after life originate

d?
Biology
1 answer:
Lunna [17]4 years ago
3 0

The predominant hypothesis for why the animals needed some 3 billion years to evolve after the life first appeared on the planet is that the conditions were not right for them to appear.

The life on Earth has appeared much earlier that what we normally assume, and also it has not been evolving very quickly, but instead it has been a very slow and gradual process. The reason for that is that the living conditions on the Earth were much different than what are they now, or anytime from the Cambrian period until the present.

The surface was still pretty hot, and there was intense volcanic activity. The composition of the atmosphere was not suitable for animals to appear at all, and in fact it would have been toxic for them. The water too had chemicals in it that were not providing the right conditions for  animals to evolve. It was only after the plants started to appear and managed to make lot of changes in the water, atmosphere, and land, than the animals were able to evolve and develop.

You might be interested in
C) If this man and woman have a child, is it possible for their child to have dry earwax?
Murrr4er [49]
Dim it depends on their parentsooooo and internet internet and internet is so good that i can get a better chance to watch the video on ur ipad and internet and it doesn’t show S
5 0
3 years ago
"Into Thin Air" A Case Study in Physiology Part II Gasping for Air by Jennifer Lundmark Department of Biological Sciences Califo
makkiz [27]

Answer:

1. The physiological changes that will occur when someone lives at altitude for an extended period include increased production of more red blood cells.

2. The changes are advantageous as the person can survive lower altitude better and strenuous activities that interferes with breathing.

3. The specific physiological pathway that results in the changes described involves decrease in pulmonary ventilation at high altitude leading to hypoxia then hypoxemia. The body then produces more red blood cells to counteract the lower oxygen saturation in blood in high altitudes.

5 0
3 years ago
Damage to the sinoatrial node in humans would ________.
Setler79 [48]

Answer:

have a decrease in blood pressure

Explanation:

hope it helped<3

mark brainlliest

7 0
3 years ago
Which is a defining trait of a mineral? A. amorphous B. made of carbon C. shiny D. definite chemical composition
zlopas [31]
<span>The physical characteristics of minerals include traits which are used to identify and describe mineral species. These traits include color, streak, luster, density, hardness, cleavage, fracture, tenacity, and crystal habit.</span>
5 0
3 years ago
What would happen if there was no greenhouse effect?
faltersainse [42]
I positive that the answer id D why because Without<span> them the Earth </span>would<span> be too cold for us, or any other living thing, to survive. Naturally occurring </span>greenhouse gases<span>, such as carbon dioxide and methane, allow solar radiation to reach the Earth's surface, while trapping radiation from the Earth on its way back out to space.

Hope I helped 

</span>
4 0
3 years ago
Read 2 more answers
Other questions:
  • The size and shape of earths surface features both on and off a map is referred to as the
    5·1 answer
  • Knowing what we know about the link between genetics, environment and intelligence, what would be your expectations if you were
    9·1 answer
  • What would happen if we didn't have photosynthesis and cellular respiration?
    8·1 answer
  • The functional role of a species in its community is its ________.
    15·1 answer
  • Consider the data on cliff swallow mortality. Why is this an example of directional selection?Overall genetic variation decrease
    12·1 answer
  • 40 POINTS PLEASE HELP
    6·1 answer
  • How will a organism be benefited if it reproduces through spores
    14·1 answer
  • What is science ? explain .​
    9·1 answer
  • PLZ HELP! What are some of the ways transport in plant cells is different from in animal cells?
    15·1 answer
  • Definicion de Regiones corporales
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!