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Neporo4naja [7]
3 years ago
15

Which statement is true about stromatolites?

Biology
2 answers:
Neko [114]3 years ago
5 0

they are layered mounds of deposits made by precambrian algae

lbvjy [14]3 years ago
3 0

Answer:

Stromatolites are the oldest forms of life for which there is clear fossil evidence.

Explanation:

Stromatolites are biogenic sedimentary rocks that are formed by capturing and binding sediment particles or precipitating dissolved substances as a result of the growth and metabolism of microorganisms in a body of water. They are mostly layered and often consist of very finely layered limestone. With their shell-like structure made of tubers, columns or undulating layers, some look like a cauliflower.

The oldest known fossils are mostly stromatolites, and they could therefore provide clues as to how life has developed from very simple to more complex forms.

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The DNA of a certain organism has adenine as 40% of its bases. What percentage of its bases would be guanine?
Mandarinka [93]

Answer:

The correct answer is B)10%. See the explanation below, please.

Explanation:

We use the following equivalence, remembering that Adenina pairs with Timina and Guanina with Cytosine:

A=T   ; C=G   A+G=T+C

If A= 40% ----> T=40%

A+G=T+C

40%+G= 40% +C   ---->  40+10=50

G=C=10%

6 0
3 years ago
True or false <br> How an animal obtains food is part of its niche
svlad2 [7]

Answer:

False

Explanation:

A niche is making a living as a top carnivore.

5 0
3 years ago
Name the four most important ligaments of the knee. What condition is characterized by an irritation and softening of the cartil
Alex787 [66]

Answer:

1. Medial collateral ligament, lateral collateral ligament, anterior cruciate ligament and posterior cruciate ligaments.      

2. Chondromalacia patellae

Explanation:

The knee is a ginglymus that connects the thigh to the leg. It is the largest joint in the human body, that plays a vital role in the horizantal and the vertical movement of the body.

There are <u>four ligaments</u> of knee joint, that joins the femur to the tibia and also provides stability by limiting movement. They are: <u>medial collateral ligament, lateral collateral ligament, anterior cruciate ligament and posterior cruciate ligaments.</u>

Chondromalacia patellae is a medical condition that includes inflammation of the cartilage on the posterior aspect of the patella, which leads to softening of the cartilage.

3 0
2 years ago
The United States uses about _____ of the oil produced in the world.
Tresset [83]
Well the U.S. consumes about 7.19 Billion barrels of petroleum related products in 2016.

The U.S. currently uses roughly 25% of all of the world's global reserves.
Hey, America likes oil, leave them alone


7 0
3 years ago
Can an organism from the food web get their energy from more than one source?
kipiarov [429]

Answer: yes

Explanation:

6 0
2 years ago
Read 2 more answers
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