The spontaneous generation of living things from nonliving things was thought to be common many years ago. Louis Pasteur used specially constructed flasks with a long S-shaped neck to prove that
A. spontaneous generation of organisms occurred in broth in the flasks.
B. oxygen was required to have living things present in the broth.
C. microorganisms had to enter the flask to get the broth to "spoil."
D. the broth "spoiled" even if organisms were not present.
C. microorganisms had to enter the flask to get the broth to "spoil."
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In which of the following situations is genetic drift likely to occur?
A. A small population of lizards is isolated on a small island. B. A mouse develops a fur coat that enables it to hide more readily from predators. C. Two schools of tuna merge together to form one large population. D. A river changes course, changing the local environment for a population of butterflies.
What are the filter feeding structures used by Christmas tree worms, pictured here?
1.cirri
2.setae
3.radulae
4.radioles
In a single family, the parents have brown eyes but all five of their children have green eyes. This is an example of evolution
Indicate whether the statement is true or false
Independent assortment means that _____
A. monohybrid crosses will show segregation and independent assortment B. the segregation of one gene pair depends on the segregation of another gene pair C. the gametes produced must be heterozygous in all cases D. the segregation of one gene pair occurs as if no other gene pair was present E. the phenotypic ratio in F2 will be the same for dihybrid and monohybrid crosses