2) The Proterozoic era is marked by the appearance of oxygen in the atmosphere. What had...

2) The Proterozoic era is marked by the appearance of oxygen in the atmosphere. What had to happen before oxygen reached the atmosphere?

4) What and when is the Cambrian Explosion?

Solutions

Expert Solution

2). The remarkable increase in the atmospheric Oxygen during the Proterozoic Era is attributed to the large-scale photosynthetic activities of bacteria and microorganisms. Though the photosynthetic bacteria first appeared earlier that this period, but major appearance occurred during this time, which led to oxygenation of the atmosphere. Further continued photosynthetic activities by organisms removed more and more CO2 from the atmosphere and supplied it with more and more oxygen. So this event preceded the atmosphere full of oxygen.

4). Cambrian Explosion refers to sudden and quick increases in the diversified life varieties on Earth. The Cambrian Explosion took place in the early Cambrian period from 541 million years ago to 530 million years ago. During this short period the life on Earth got diversified and Specialised into most of today found phyla of life. So due to this radical change in this comparatively short period, this event is known as Cambrian Explosion.

Amanda K answered 8 months ago

Next > < Previous

Related Solutions

1. What did the production of oxygen by photosynthetic organisms form in the atmosphere? 2. Explain...

1. What did the production of oxygen by photosynthetic organisms form in the atmosphere? 2. Explain what a plant is. (What makes plants different from other organisms? a. What are carnivorous plants and where do they grow? 3. Explain the two challenges plants faced with moving onto land. 4. Explain the two physiological plant adaptations which allowed for plant life on land. 5. What are the key features that make the four categories of plants different?Non-vascular:Vascular seedless: Gymnosperms:Angiosperms: a. List...

Describe what happens to molecular oxygen in the upper atmosphere when exposed to radiation at λ...

Describe what happens to molecular oxygen in the upper atmosphere when exposed to radiation at λ = 1030 – 1070 Å and radiation at λ = 1027 Å. Description should include name of the process occurring and the type products (to include charge).

Compute the concentration of oxygen that will dissolve in seawater at equilibrium with the earth's atmosphere...

Compute the concentration of oxygen that will dissolve in seawater at equilibrium with the earth's atmosphere at 15oC. (Chlorinity of seawater = 19g/L or 19,000mg/L.

A mountain climber ascends to an altitude where the partial pressure of oxygen in the atmosphere...

A mountain climber ascends to an altitude where the partial pressure of oxygen in the atmosphere is very low. a. What happens to the climber’s ventilation rate? b. Which chemoreceptor (oxygen or carbon dioxide/pH) would cause this change in ventilation rate at high altitude? Your answer should reflect that you know the stimuli for change in ventilation rate under different conditions c. What happens to plasma concentrations of carbon dioxide after a period of time hyperventilation? d. What happens to...

A mountain climber ascends to an altitude where the partial pressure of oxygen in the atmosphere...

A mountain climber ascends to an altitude where the partial pressure of oxygen in the atmosphere is very low. 1. What happens to levels of erythropoietin in the blood after a period of time at high elevations? 2.How does a low concentration of oxygen in the alveoli affect the state of contraction of pulmonary arterioles? 3.Explain why pulmonary edema is a symptom of altitude sickness

The atmosphere is a giant sedimentation equilibrium experiment. Nitrogen and oxygen are pulled down by the...

The atmosphere is a giant sedimentation equilibrium experiment. Nitrogen and oxygen are pulled down by the gravitational potential, and diffuse back upwards due to entropy. Assuming the earth’s gravitational acceleration is uniform and 9.802 m s–2, and the average temperature of the atmosphere is –20°C, and the pressure of N2 and O2 at sea-level are 0.79 and 0.20 bar respectively, calculate the pressure of nitrogen and oxygen at the elevation of a transatlantic airplane flight (10 km).

Nitrogen and oxygen do not react appreciably at room temperature, as illustrated by our atmosphere. But...

Nitrogen and oxygen do not react appreciably at room temperature, as illustrated by our atmosphere. But at high temperatures, the reaction below can proceed to a measurable extent. N2(g) + O2(g) ⇔ 2 NO(g) At 3000 K, the reaction above has Keq = 0.0153. If 0.2702 mol of pure NO is injected into an evacuated 2.0-L container and heated to 3000K, what will be the equilibrium concentration of NO?

Summarise the ways in which oxygen may be exchanged between a riverine flow and the atmosphere....

Summarise the ways in which oxygen may be exchanged between a riverine flow and the atmosphere. b) Sketch a typical oxygen-sag curve, labelling the axes and indicating any important points on the curve. . c) State four biological, or chemical, factors that can affect the quality of a body of water. d) Describe, with the aid of a sketch, three typical zones within a mature river system as differentiated by their dominant sediment transport processes. (

Nitrogen and oxygen do not react appreciably at room temperature, as illustrated by our atmosphere. But...

Nitrogen and oxygen do not react appreciably at room temperature, as illustrated by our atmosphere. But at high temperatures, the reaction below can proceed to a measurable extent. N2(g) + O2(g) ⇔ 2 NO(g) At 3000 K, the reaction above has Keq = 0.0153. If 0.1852 mol of pure NO is injected into an evacuated 2.0-L container and heated to 3000K, what will be the equilibrium concentration of NO?

What accounts for the difference in appearance between lead 2 and lead AVR on an EKG?...

What accounts for the difference in appearance between lead 2 and lead AVR on an EKG? Explain the answer in relation to the hexaxial limb lead reference system.

Subjects