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
Lesechka [4]
3 years ago
9

¿A qué se debió el incremento en la cantidad de oxígeno en la atmósfera hace miles de millones de años?

Spanish
1 answer:
Maslowich3 years ago
3 0

Scientists think that algae first evolved approximately 2.7 billion years ago, and soon after this oxygen began to exist in the atmosphere. Photosynthesis by primitive plants and algae released oxygen, which gradually built up in the atmosphere.

Explanation:

You might be interested in
1. La Maison es un mercado al aire libre. a. cierto b. falso 2. La Maison vende ropa muy elegante y nueva. a. cierto b. falso 3.
Mekhanik [1.2K]

Answer:

1.La Maison es un mercado al aire libre.  <em>b. falso </em>

2.La Maison vende ropa muy elegante y nueva. <em>a. cierto </em>

3.Guido Asenjo Puebla diseña ropa y también pinta (paints). <em>a. cierto </em>

4 0
3 years ago
Which of these is true about most public schools in puerto rico
arlik [135]
(I chose one of the three options, because when I asked how many where there; I got no answer)
 --------------------------------------------------------------------------------------------------------------------------------
I believe the answer is <span><em>public schools start at 9 AM every day</em></span>.


<em>Option 1</em><em> RIGHT</em>
I think the answer is the first one because I went to public schools and I noticed that. 
<em>
Option 2 </em><em>WRONG</em><em />
I think the second option isn't right because public schools' basic subjects are studied in english.
<em>
Option 3 </em><em>WRONG</em>
It's wrong because most people live near the school that they can go by walking and/or biking.
3 0
3 years ago
Porque es importante lo que pensamos acerca de nosotros mismos?
Andreas93 [3]
Por que eso muestra nuestro amor por nosotros mismos. 
4 0
3 years ago
Read 2 more answers
What is the dominant trait of Western Martial Arts?​
elena-s [515]

Answer:

kick boxing

Explanation:

6 0
3 years ago
Read 2 more answers
Tengo trece ___?<br> 50 points. plssss
Yuki888 [10]
Translation: I have 13____
Answer: años

Tengo trece años
( I am 13 year old )
8 0
3 years ago
Read 2 more answers
Other questions:
  • Existe un país (1) ___________ el mate tuvo que adaptarse a su clima: Paraguay. En este país, (2) ___________ clima es subtropic
    5·1 answer
  • Change the verb to indicate that it is an activity that is currently in progress using the correct form of Estar in Blank 1 and
    6·2 answers
  • . ¿Cómo se dice "The weather is nice." en español? (2 points) Hace mal tiempo. Hace buen tiempo. Hace bien tiempo. Hace fresco.
    13·2 answers
  • Alguien puede hacer oraciones con la palabra soberbio
    6·1 answer
  • Which province shares an indigenous culture with Colombia?
    15·1 answer
  • Cual es tu fruta favorita?
    7·2 answers
  • Los Estados Unidos con nombres espa?oles son San Francisco, San Diego, y San Jose.
    7·1 answer
  • Help pls Spanish. 3....
    11·1 answer
  • Nadie comprar el retrato porque fue demasiado caro.
    8·1 answer
  • PLEASE HELP! 60 POINTS!!! I need this done today! Francisco de Quevedo y Villegas
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!