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natta225 [31]
3 years ago
11

Scientists believe that the first prokaryotes on Earth arose ________ years ago, and the first eukaryotes arose ________ years l

ater.
Biology
1 answer:
Gwar [14]3 years ago
8 0

Answer:

3.5 billion years ago Prokaryotes arose and around 2 billion years later of Eukaryotes arose.

Explanation:

While there is some ambiguity for eukaryotes but the general consensus are on the number given

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In horses, the allele for a black coat (B) is dominant over the allele for a brown coat (b). A cross between a black horse and a
GaryK [48]

Answer:

Bb X bb

Explanation:

  • It is given that the allele B for the black coat is dominant over allele b for a brown coat.
  • A dominant allele always leads to the expression of the dominant trait in the heterozygous condition. 
  • When a black and brown horse is crossed as given in the question and the result is a brown foal, then the genotype of the brown foal must be bb as the brown coat is a recessive trait. 
  • Since each parent contributes one allele each for a given gene, the black horse must have b allele, and hence must be heterozygous Bb.
  • The cross is shown in the punnett square.

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3 years ago
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4 years ago
Which are structures of the excretory system? Check all that apply. kidney spleen bladder esophagus ureter urethra
oksian1 [2.3K]
The organs listed above are all part of the excretory system except for the spleen and the <span>esophagus.
</span><span>The kidneys act to filter our blood, and remove wastes, which eventually pass out of us through urine,
The bladder acts to collect and store urine until it can be emptied through urination.
The ureter runs from the kidneys to the bladder whereas the urethra runs from the bladder to exit the body.</span>
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3 years ago
8. Agent that kills microorganisms, rather than inhibits it:
Softa [21]

Agent that kills microorganisms, rather than inhibits it: bactericid e

Microbial growth can be controlled and that control usually involves the use of physical or chemical agents. Chemical agents which either kill the microorganisms are called cidal agents while those that prevent their growth are referred to as static agents. of microorganisms. Thus, the term bactericidal refers to killing bacteria, and bacteriostatic refers to inhibiting the growth of bacterial cells.  

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Which property of a rock determines its color?
zaharov [31]

Answer:

method of formation

Explanation:

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3 years ago
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