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olga_2 [115]
3 years ago
6

Changes in the trilobite exoskeleton can be attributed to______

Biology
1 answer:
GalinKa [24]3 years ago
6 0
Changing environments and competition for survival are the answer so D is the correct answer 
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What percent of their female progeny will show the cleft chin trait?
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3 years ago
Which best describes a gene
motikmotik

Answer;

a segment of chromosomal DNA

Explanation;

A gene is a  hereditary unit consisting of a sequence of DNA that occupies a specific location on a chromosome and determines a particular characteristic in an organism. Genes undergo mutation when their DNA sequence changes.

It is the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions to make molecules called proteins.  However, many genes do not code for proteins.

Alleles are forms of the same gene with small differences in their sequence of DNA bases. These small differences contribute to each person’s unique physical features.

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Which diagram correctly shows how heterozygous alleles are found on homologous chromosomes?
givi [52]

Answer:

C

Explanation:

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2 years ago
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Describe physical or mental disability of Down syndrome
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Answer:

It is usually associated with physical growth delays, mild to moderate intellectual disability, and characteristic facial features. The average IQ of a young adult with Down syndrome is 50, equivalent to the mental ability of an eight- or nine-year-old child, but this can vary widely.

Symptoms: Delayed physical growth, characteristic facial features, mild to moderate i...

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Risk factors: Older age of mother, prior affected child

Explanation:

Hope it helps

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