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elena55 [62]
4 years ago
13

Scientists believe ___ were the first types of cells able to make their own food.

Biology
2 answers:
zheka24 [161]4 years ago
4 0

Answer: a. cyanobacteria

Explanation:

Cynobacteria is considered to be the first organism on earth which was capable of producing it's own food by the process of photosynthesis. The cynobacterial strain used to exists on earth around 3.5 billion years ago. These were the first unicellular prokaryotic organisms. They had a large number of colonies. These were responsible for the liberation of large amount of oxygen in the oxygen deficient primitive earth atmosphere.    

SVETLANKA909090 [29]4 years ago
3 0

B. Chemoautotrophs is the answer

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Free earlobes are dominant over attached earlobes. What is the probability that a woman with attached earlobes (homozygous reces
AVprozaik [17]
<h2>The correct answer is explained below:</h2>

Explanation:

  • According to the question, free ear lobes are dominant over attached ear lobes.
  • Let the allele for free ear lobes be represented by F.
  • Let the allele for attached ear lobes be represented by f.
  • The genotype of the homozygous recessive woman (mother) having attached ear lobes is : ff.
  • The gamete produced by the woman is: f.
  • The genotype of the heterozygous man (father) with free earlobes is: Ff.
  • The gametes produced by the man are: F and f.
  • Mating the man with the woman we get the following offspring,

                                        F                                            f

                           f           Ff                                          ff

          Phenotype      Free ear lobe                   Attached ear lobe

  • The genotype and the phenotype of the probable children obtained is represented in the Punnett square above.
  • The probability that the parents would produce children with attached ear lobes is = \frac{1}{2} .
4 0
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Autotrophic organisms convert energy from the sun into the bonds of glucose but heterotrophic organisms convert energy from gluc
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It talks about density!
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Answer:

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Explanation:

I went over my notes and i have finished this quiz.

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