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kipiarov [429]
3 years ago
13

What is the predominant hypothesis why animals only appeared in the fossil record about 3 billion years after life originated?

Biology
1 answer:
Amiraneli [1.4K]3 years ago
3 0
A. There were animals 3 billion years ago; they just weren't fossilized. B. Animals are warm-blooded; the ocean was too cold for animals.
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which sentences best describes the difference between photosynthesis and cellular respiration? Check all that apply.
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Photo Synthesis would be as plants grow from the sun or gain energy from the sun, where as Cellular Respiration is when cells divide into two or more. (I believe)
7 0
3 years ago
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.True or False: Clear-cutting results in mostly even-aged stands of trees
seropon [69]

Answer:

my guess is

Explanation:

true

true

true

4 0
3 years ago
How can two organisms with a dominant trait for a specific feature produce an organism with a recessive trait for the same featu
Liono4ka [1.6K]

Answer:

If the two organisms are heterozygous for the dominant trait.

Explanation:

For every trait, a diploid organism receives two forms of gene called ALLELE, from each parent. Allele is the variant form of a gene.

According to Mendel's law of dominance, for a particular trait, an allele is capable of masking the expression of another allele in a gene. The expressed allele is called the DOMINANT allele while the masked allele is called the RECESSIVE allele. Due to this, an organism can express a dominant trait even in a combined or heterozygous state i.e. different alleles.

When the two heterozygous organisms mate or are crossed, they undergo meiosis and their alleles are separated into GAMETES according to Mendel's law of segregation. For example; an organism with genotype (genetic make-up) Aa will produce gametes with A and a alleles.

Note that, a recessive trait can only be expressed in a homozygous state i.e. same allele. Hence, the two heterozygous organisms will produce gametes containing the recessive allele, which will likely combine to produce a recessive phenotype or trait.

8 0
3 years ago
Asexually reproducing organisms produce offspring that are genetically identical to each other and to the parents. What type of
Bad White [126]

Respuesta:

Es  mitotic

Explanation:

Pues la mitosis es un proceso de división celular ligado a la reproducción asexual, en la que únicamente es necesario un individuo para generar descendecia.

8 0
2 years ago
Which substance is a product of photosynthesis?
ElenaW [278]
A product of photosynthesis is glucose which is a sugar. This sugar(glucose) is food for the plants.
5 0
3 years ago
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