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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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List the four major hypotheses mendel developed using his garden pea experiments.
Andreas93 [3]
I believe the hypothesis developed by Mendel as a result of his experiments with the garden pea include;
1. For each inherited trait, an individual has two copies of genes-one fromeach parent.
2. There are alternative versions of genes. Today the different versions of a gene are called its  alleles
3. When two different alleles occur together, one of them may be completely expressed, while the other may have no observable effect on the organisms appearance. Mendel described the expressed form of trait as dominant. The trait that was not expressed when the dominant form of the trait was present was described as recessive.
4. When gametes are formed, the alleles for each gene in an individual separate independently of one another. Thus, gametes carry only one allele for each inherited trait. When gametes unite during fertilization, each gamete contributes one allele.
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3 years ago
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Aneli [31]

Answer:teacher

Explanation:

teachers explain things

5 0
3 years ago
True or false Fats are usually of animal origin while oils are usually of plant origin
DaniilM [7]

Answer:

It is TURE

Fats are usually of animal origin while oils are usually of plant origin. Fats and oils function well as energy-storage molecules because they contain carbon.

8 0
4 years ago
Which statement best describes tendon sheaths?
myrzilka [38]

Answer:

Tendon sheaths protect long tendons as they course over and around synovial joints.

Explanation:

Tendon sheaths are tubes of tissue filled with a lubricating fluid that surround the tendons like a tunnel. The tendon sheath prevents the tendon from fraying or being exposed to excessive friction. The inside of the sheath is lined with synovial fluid. This allows the tendon to slide forward and backward. From this we can say that the tendon sheaths protect the long tendons as they travel through the synovial joints.

8 0
3 years ago
In a chemical reaction, (blank)<br> are the substances present after the reaction.
S_A_V [24]

Answer:

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Explanation: Substances present BEFORE a reaction occurs are described as reactants. Substances present AFTER a reaction has occurred are described as products

8 0
4 years ago
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