The energy came from the sun.
The sun increase the temperature on every water surface on the earth which make it transform from liquid to gas, and eventually from cloud.
When the clound condensed, it will fall on top of the geological surface in the form of rain and some of it will fallen to the river and eventually came back to the sea to complete the cycle.
Answer:
The statement that is true is B. Specialized cells allow for different organs to work together to perform a function.
Explanation:
The phenomenon of cell differentiation allows different cells to have contrasting structures and functions. Each cell can be shaped according to its function based on this phenomenon. For example the erythrocytes have a hollow structure which allows it to carry oxygen from the lungs to other parts of the body.
Specialized cells that work together form tissues. For eg, the epithelial cells from the skin and small intestine form the epithelial tissue which functions to protect the body surfaces. And tissues work together to form organs, and different organs work together due to the functioning of specialized cells.
Answer:
They will behave as if they were independent.
Explanation:
The frequency of recombination between genes is directly proportional to the distance between them in the chromosome. The longer the distance, the higher the recombination frequency.
The maximum recombination frequency between two genes is 50%, because every time recombination happens between 2 chromatids, half of the resulting gametes will be recombinant and the other half will be parental. So if the genes are independent, the observed recombination frequency will be 50%.
1 map unit = 1% frequency of recombination. If the genes are in the same chromosome, but separated by 50 map units or more, the recombination frequency will be 50% and they will behave as they were independent, located in different chromosomes.
Gel electrophoresis shows your DNA. Its how they compare it in criminal cases