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3 years ago

The history of life on Earth is recorded in _____.

Biology

2 answers:

lilavasa [31]3 years ago

6 0

rock fossils history of life

mart [117]3 years ago

5 0

Answer:

Option A

Explanation:

The rock fossils depict the history of life because they consist of several deposits of old age fossil in different layers of rock strata. The layer of rock strata which lies at the bottom of any rock deposits is the oldest layer. By examining this oldest layer one can determine the prevailing atmospheric condition at the time of its formation. Also, examining the remains of fossil can help us to understand the forms of life existing during that time.

In this way all the layer of rock strata can be examined one by one from bottom (oldest) to top (youngest). This shall also allow us to understand the pattern of evolution of biological species with time.

Hence, option A is correct

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Which of the following sequences describes the general life cycle of a eukaryotic organism? a. 1N meiosis 2N fertilization 1N b.

ehidna [41]

Answer:

b. 2N meiosis 1N fertilization 2N

Explanation:

In eukaryotic organisms, gamete mother cells are diploid (2N) and have two complete sets of chromosomes. Meiosis in male and female gamete mother cells form haploid male and female gametes (N) respectively. This occurs since meiosis reduces the number of the chromosome to half in the daughter cells. The fusion of haploid male and female gametes during fertilization restores the diploid chromosome number of the species and forms diploid zygote (2N). Repeated mitotic divisions in the diploid zygote form the diploid organism.

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3 years ago

Biological membranes are selectively permeable, allowing certain molecules to cross the membrane, but not others. Sort the molec

Anuta_ua [19.1K]

Passive transport:

For simple diffusion = fatty acids, amino acids, steroid hormones (because they’re non-polar)

Facilitated diffusion = N2 and Cl-

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3 years ago

6. who discovered the three-dimensional structure of dna in 1953?

Ghella [55]

James Watson andFrancis Crick discovered the three-dimensional structure of dna in 1953

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3 years ago

The same amino acid can be carried by different tRNA's. true or false

Nataly_w [17]

The answer for this is true

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4 years ago

Read 2 more answers

which classification level is broader than the kingdom level; which branch of biology is concerned with the naming and classifyi

shtirl [24]

Domain is broader than the kingdom level.

Levels of classification that are broader than phylum are regions and kingdoms. There are five kingdoms: Monrea, Protista, Fungi, Plants.

Taxanomy is the branch of biology concerned with the naming and classifying of organisms.

Protists are described as diverse organisms because they have many different characteristics. They are either heterotrophs or autotrophs. They are also eukaryotes that are not classified as plants, animals or fungi.

Animals group of organisms includes only multicellular heterotrophs.

If two species belong to the same class, they also belong to the same taxon higher up in the hierarchy. Here they belong to the same side and kingdom.

The gradual change in a species over time is called Evolution.

The levels of classification that are broader than the phylum are domains and kingdoms.

Taxonomy is the science of naming, describing and classifying all living organisms, including plants.

To know more about Taxanomy here

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1 year ago