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mafiozo [28]
3 years ago
9

Please help this is due today!!!!

Biology
1 answer:
lubasha [3.4K]3 years ago
7 0

Answer:

Natural selection occurs if four conditions are met: reproduction, heredity, variation in physical characteristics and variation in number of offspring per individual.

Explanation:

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The structure of the spinal cord can be described as (1) composed of thirty-one segments (2) having a cervical enlargement and a
tensa zangetsu [6.8K]

Answer: The structure of the spinal cord can be described as consisting of all the above named.

Explanation:The spinal cord is the main pathway for information connecting the brain and peripheral nervous system. Much shorter than its protecting spinal column, the human spinal cord originates in the brainstem, passes through the foramen magnum, and continues through to the conus medullaris near the second lumbar vertebra before terminating in a fibrous extension known as the filum terminale.

It is about 45 cm (18 in) long in men and around 43 cm (17 in) in women, ovoid-shaped, and is enlarged in the cervical and lumbar regions.

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3 years ago
What are the 6 steps of photosynthesis
umka2103 [35]
The 6 steps of photosynthesis are
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3 years ago
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AleksAgata [21]

true is the correct answer

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3 years ago
Alternation of generations in plants refers to the fact that plants make a multicellular haploid structure (free living in some
Yuki888 [10]

Answer:

True.

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The life of a plant alternates between haploid and diploid generations. From a fully matured diploid plant (2n) which is known as sporophytic generation a lot of spores which are haploid are produced by the process of meiosis. By the process of mitosis, these spores then develop into new multi-cellular plant which is also haploid just like spores (n), this phase of plant life cycle is known as gametophytic phase. This haploid plant is capable of producing gametes (n) which are also haploid. When two such gametes from the same or different plant fuse with each other a diploid cell is produced which is known as zygote (2n). This zygote subsequently divides and grows into a diploid plant which is a part of sporophytic generation. This is how the entire life cycle of various plants alternate between gametophytic and sporophytic phase.

This diploid plant then later again produces spores and the cycle of reproduction goes on in the same manner as described above.

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