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2 years ago

How did cyanobacteria affect Earths atmosphere during the Proterozoic Eon?

Biology

1 answer:

dalvyx [7]2 years ago

7 0

Answer:

These microbes conduct photosynthesis: using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen. In fact, all the plants on Earth incorporate symbiotic cyanobacteria. For some untold eons prior to the evolution of these cyanobacteria, during the Archean eon, more primitive microbes lived the real old-fashioned way: anaerobically. These ancient organisms—and their "extremophile" descendants today—thrived in the absence of oxygen, relying on sulfate for their energy needs. But roughly 2.45 billion years ago, the isotopic ratio of sulfur transformed, indicating that for the first time oxygen was becoming a significant component of Earth's atmosphere,

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Jake has a can of soda that is at room temperature. He places the soda can in the freezer. The next day, Jake looks in the freez

MrRissso [65]

Answer:

Because of the pressure build up. it also expanded

Explanation:

3 0

3 years ago

Dr. marquette is a researcher who studies the encoding, storage, and retrieval of information throughout life. what approach to

azamat

Ans.

Cognitive development is defined as the making-up of thought processes, such as decision-making, problem solving, and remembering processes, from childhood to adulthood through adolescence.

The approach of cognitive development, which includes the goal to understand the human thinking by study of encoding, recovery, and storage of information, is known as information processing.

Thus, 'Dr. Marquette has take information processing approach of cognitive development in her studies.'

5 0

3 years ago

ARE FINS LIMBS?? GOOD ANSWER OR ELSE I WILL REPORT YOU.

Alchen [17]

Answer:

Fins are limbs.

Explanation:

A limb is considered an appendage of any body. Since a fin is an appendage of an animal body, it is indeed a limb.

5 0

2 years ago

Read 2 more answers

A 6,000 kg train car is moving to the right at 10 m/s and connects to a 4,000-kg train car that wasn't moving. What is the veloc

SIZIF [17.4K]

6 m/s

This type of collision is a <u>Inelastic collision </u>

Explanation:

We begin by finding the momentum of the initial train car;

Remember that momentum is given by the formulae mass (kg) * velocity (m/s)

Therefore;

Momentum = 6000 * 10

= 60,000 kg⋅m/s

The other car has zero momentum because;

4000 * 0

= 0

When the two train cars collide, the total momentum will be;

60,000 + 0 = 60,000

Therefore to find the velocity, well use the same formulae;

p = mv whereby;

p – momentum

m – mass

v – velocity

60,000 = (6000 + 4000) * v

v = 60,000 / 10,000

v = 6

= 6 m/s

This is an elastic collision because we are assuming that no energy is lost in the collision. Most collisions, however, are not elastic but rather inelastic. In inelastic collision some of the kinetic energy is lost to the environment in some other form of energy such as heat energy.

Learn More:

For more on elastic collisions check out;

brainly.com/question/10864123

\brainly.com/question/12201392

#LearnWithBrainly

7 0

3 years ago

The city of Los Angeles wants to know if there is a connection between physical fitness and air pollution. Fifty volunteers from

zheka24 [161]

Answer:

Control group: volunteer stationary bike riders in a pollution-free chamber

Experimental group: volunteer stationary bike riders in a chamber filled with air pollutants common to Los Angeles

Independent variable: exposure to air pollution

Dependent variable: The heart rates (physical fitness) of the volunteer riders.

Explanation:

In a scientific experiment, data is compared between the control group and experimental group to ascertain the effect of the independent variable on the dependent variable. A control group is the group in an experiment that is not treated with the independent variable i.e. the independent variable is controlled while the experimental group is the group that is treated with an independent variable.

N.B: The independent variable is the variable controlled by the experimenter in order to influence the dependent variable (measurable outcome).

In this experiment, the independent variable is the AIR POLLUTION the volunteer riders are exposed to while the dependent variable is the PHYSICAL FITNESS/ HEART RATES of the volunteer riders, which is dependent on the exposure to air pollution (independent variable).

The control group in this experiment is the volunteer riders placed in a POLLUTION-FREE CHAMBER where the independent variable cannot influence or have any effect on the measurable variable (dependent). The experimental group is the volunteer riders placed in a CHAMBER FILLED WITH AIR POLLUTANTS. The independent variable (air pollution) has been changed in the experimental group.

4 0

2 years ago