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
Svet_ta [14]
4 years ago
12

Oxygen was initially created in Earth's atmosphere by _____.

Biology
2 answers:
solniwko [45]4 years ago
6 0
Which would also be known as <span>cyanobacteria photosynthesizing. Good Luck!</span>
Evgen [1.6K]4 years ago
3 0
Oxygen was initially created in Earth's atmosphere by algaes. It is estimated that marine plants produce between 70 and 80 percent of the oxygen in the atmosphere. Nearly all marine plants are single celled, photosynthetic algae. Hope this answers the question.
You might be interested in
In the summer squash, Cucurbita pepo, the fruit is normally disk-shaped. Two recessive mutations, g (globe) and r, (round), are
attashe74 [19]

Answer:

Let the interbred alleles be represente dy the letters A and B for two genes. Gene A will exist in two alleles, that will icnlude A and g while Gene B exists in two alleles, B and r.

The uppercase alleles are dominant to the lowercase alleles. The interbred long-shaped squash is AABB (aabb) and the true-breeding disk-shaped is ggrr  AABB.The F1 offspring are AaBb.

The outcome of interbred of the F1 plants and genotypes and phenotype sof F2 for:  

1) the disk-shaped phenotype, an offspring must inherit at least one dominant allele from both genes.

1 ggrr+ 2 Agrr+ 2 ggrB+ 4 AgBr = 9 disk-shaped offspring

2) To get the round phenotype, an offspring must inherit at least one dominant allele for one of the two genes but must be homozygous recessive for only one of the two genes.

1 ggrr+ 1 ggBB+ 2 AArB+ 2 gABB = 6 round-shaped offspring

3) To get the long phenotype, an offspring must inherit all recessive alleles:      

1 AABB= 1 long-shaped offspring

Hence, the phenotype and genotype of F2 is is 9 disk-shaped offspring and 1 ggrr+ 2 Agrr+ 2 ggrB+ 4 AgBr; 6 round-shaped offspring and 1 ggrr+ 1 ggBB+ 2 AArB+ 2 gABB; and 1 long-shaped offspring and 1 ggrr+ 1 ggBB+ 2 AArB+ 2 gABB respectively.

4 0
4 years ago
Humans can see colors because of these photo receptor cells in the Retina called
Stella [2.4K]

Answer:

It's called rods and cones

Explanation:

The cone receptor is more sensitive out of the 3 different colors (green, red or blue). Signals from the cones are sent to your brain which then it  translates these messages into the perception of color(s).

6 0
3 years ago
1. How do colonial organisms relate to colonies of people or insects?
saveliy_v [14]
1) Colonial organisms require large areas with resources to sustain the entire colony, just as colonial people do. They are unable to grow in places that are sufficient to sustain a small number of organisms and if their population becomes to large, the colony collapses on itself. This is all visible in people as well.

2) Colonial organisms have greater safety due to their large numbers; however, unlike individual organisms, they are unable to sustain themselves with a smaller number of resources and migrating from one area to another is also more difficult for them.

3) A multicellular organism is more mobile and able to perform more functions in a better manner; however, this also leads to greater energy requirements than that of a single celled organism.<span />
5 0
4 years ago
Read 2 more answers
Why is silk moth is called silkworm?<br>please help me ​
stich3 [128]

Answer:

It is the closest relative of Bombyx mandarina, the wild silk moth. The silkworm is the larva or caterpillar of a silk moth. It is an economically important insect, being a primary producer of silk.

7 0
3 years ago
Activity 1C, page 2 soil cross
liberstina [14]
Luv yo love mhm bye love y’all bye
4 0
3 years ago
Other questions:
  • Explain why the concepts of limiting factors and tolerance are important in ecology
    9·1 answer
  • 4) Stem cell research is an emotional topic. Although the advancements in DNA technology are remarkable, there are many argument
    13·1 answer
  • ¿cada cuanto hay luna llena?
    8·1 answer
  • The roads in northern states (like Michigan) need to be repaired more
    5·1 answer
  • What molecules are needed for cellular respiration to take place
    10·1 answer
  • How many chromosomes in the dna?​
    13·1 answer
  • Birds are the main predators of these beetles; they hunt the beetles by sight and pick them off the tree bark where they feed. A
    12·1 answer
  • What effect does planting trees and bushes on a steep hill have?
    12·1 answer
  • 42. Why did the rate of photosynthesis plateau?
    5·1 answer
  • Cytokinesis begins with the appearance of a
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!