By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind. This is why scientists cannot be certain about how life began.
I think it's 83 million base pairs.
<h2>Answer:</h2>
<em>True.</em><em> Yes the sun is the ultimate source of energy.</em>
Explanation:
- We all living organism needs energy for their survival like for walking, talking and breathing.
- Energy is required by every cell for their reproduction, growth and maintenance.
- We all eat food to get that energy. Food is consists of plants and meat of some animal.
- These some animals also get food from plant.
- Plants take sun light to make their food/energy.
- Sun just provide energy in form of food. It dose not get energy from anywhere.
- Hence we all are ultimately depends on sun.
All of the above is the answer.
Answer:
The number of STR repeats is unique and therefore it is considered as an allele of that <em>locus</em>
Explanation:
Short Tandem Repeats (STRs), also known as microsatellites or simple sequence repeats (SSRs), are short DNA sequences with a size of 1-6 nucleotide bases which may be many times repeated in tandem. STRs localize in specific regions of the genome (<em>loci</em>) and therefore they are molecular markers. Gel electrophoresis a technique used to separate DNA fragments based on their size. In consequence, the pattern of STR repeats or 'alleles' obtained by electrophoresis can be used to identify individuals. In a gel electrophoresis, STR markers produce different bands that run more slowly or faster on the gel in different lanes according to their size (e.g., more slowly >> higher size of the STR sequence), and thereby STR alleles are unique and serve to identify individuals.
