Answer:
1. a population of robins die
2. individual - population - community - ecosystem
3. fluctuating slightly over time
4. all members of a particular species in a specific area at a certain time
5. The caterpillars only eat milkweed plants
Explanation:
I just took and these are answers.
Humans and animals need oxygen to survive so oxygen in the atmosphere maintains life on earth for humans and animals to breathe to survive
D. intensive irrigation i guess well i have the same question
<span>Crossover is the first way that genes are shuffled to give rise to genetic diversity. Crossover takes place in sexual reproduction. Chromosomes line up side by side and break off pieces of themselves, then trade those pieces with each other. When they break at the same place (locus) in the sequence of base pairs, the result is an exchange of genes called genetic recombination. That is the normal way for crossover to occur. Genetic recombination ensures that the daughter cells produced have a different genetic makeup from the parent cell and thus diversity is created.</span>