subject

Biology, 22.09.2019 14:20 leslylinares454

Which of the following is hypothesized to be the early source of free oxygen in earth's atmosphere? a. photosynthesis by cyanobacteria b. ionization of water molecules c. respiration of fish d. decay of animal remains

ansver

Answers: 2

Show answers

Another question on Biology

question

Biology, 22.06.2019 00:30

What was the land like over 500 million years ago? what was under the sea?

Answers: 1

question

Biology, 22.06.2019 04:30

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Answers: 3

question

Biology, 22.06.2019 10:50

What is it called when part of a cell membrane closes around a molecule to allow the molecule to enter the cell? a. passive transport b.diffusion c. endocytosis d. exocytosisc. endocytosis

Answers: 2

question

Biology, 22.06.2019 17:00

First dropdown options: a. runoff b. condensation c. evaporation second dropdown options: a. photosynthesis b. transpiration c. sweating third dropdown options: a. raindrops b. clouds c. animals

Answers: 1

You know the right answer?

Which of the following is hypothesized to be the early source of free oxygen in earth's atmosphere?...

Questions

question

Social Studies, 14.07.2019 20:10

When she first joined the army, stephanie was not entirely sure she would like it, but was excited about the thought of traveling around the world. by...

question

Biology, 14.07.2019 20:10

When one species of an ecosystem is endangered, other species that interact with or depend on it are never negatively impacted due to immediate adapta...

question

Mathematics, 14.07.2019 20:10

When using a multiplicative power function (y = a x1b1 x2b2 x3b3) to represent an economic relationship, estimates of the parameters (a, and the b's)...

question

Mathematics, 14.07.2019 20:10

1000 raffle tickets are sold for $1 each. one prize of $200 is to be awarded. find the fair price of a ticket....

question

Mathematics, 14.07.2019 20:10

The sides of a triangle are in the ratio 3 : 4 : 5. what is the length of each side of the perimeter of the triangle is 72 cm?...

question

History, 14.07.2019 20:10

How did the ancient greeks change the ways in which people dealt with legal issues...

question

Physics, 14.07.2019 20:10

How to find coefficient of kinetic friction given acceleration and mass?...

question

History, 14.07.2019 20:10

While running an idea began to fascinate elie. what was the idea?...

question

Physics, 14.07.2019 20:10

How would a 50 percent increase in earth's albedo impact average surface temperatures?...

question

Mathematics, 14.07.2019 20:10

The area of a square is 225 square inches. find the length of one side...

question

Physics, 14.07.2019 20:10

If a rocket is propelled while in space, is the momentum of the rocket itself (not including the exhaust products) conserved?...

question

Physics, 14.07.2019 20:10

If a capacitor has opposite 4.9 μc charges on the plates, and an electric field of 1.6 kv/mm is desired between the plates, what must each plate's are...

question

Mathematics, 14.07.2019 20:10

What conclusions can be made about the series ∞ 6 cos(πn) n n = 1 and the integral test?...

question

Mathematics, 14.07.2019 20:10

On a particular road map 1/2 inch represents 18 miles about how many miles apart are 2 towns that are 21/2 inches apart on this map...

question

Biology, 14.07.2019 20:10

Q40 stem cells that can differentiate into osteoblasts are called cells....

question

English, 14.07.2019 20:10

Identify the sentence in which all words are used and spelled correctly. a. the lion tamers put on quits a good show b. the lion tamers put on quit...

question

History, 14.07.2019 20:10

The earliest record of the public admiring a drawing was recounted by...

question

Mathematics, 14.07.2019 20:10

The diameter of the circle above is 94 cm. what is the circumference of the circle? (use = 3.14.)...

question

Mathematics, 14.07.2019 20:10

Stan flips 5 coins. what is the probability that stan sees at least one head and one tail?...

question

Social Studies, 14.07.2019 20:10

Sociologists define the concept of "race" as science forums...

More questions: Biology Another questions

Questions on the website: 13722367