Answer:
The pericardium is the most outer layer of the heart. Main function to protect the heart from external forces/entry.
Answer:
A lot of birds sing or dance to attract their mates or show off their beautiful colors. Fireflies flash their lights to attract females.
Explanation:
See answer above.
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Answer:
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
Explanation:
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Answer:
Decrease
Explanation:
If the foxes have nothing to eat, some will starve and die so the population will decrease.
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