Since the beginning of time, some people have believed that the earth is flat. beginning around 300 b. c., however, some began to wonder if the earth is actually spherical in shape. those that favored the flat earth theory made the following observations: the earth is stable because it is a flat landmass sandwiched between a flat layer of air and a flat layer of water. if the earth is spherical, then oceans should be curved on top, but they aren't. some rivers flow for hundreds of miles but only fall a few feet. the rivers should fall farther if the earth is spherical. if the earth is spherical, people and animals that inhabit the earth would notice as they walked along its surface. since mariners are able to use flat compasses to navigate their ships without crashing, the earth must not be a sphere. those that disputed the flat earth theory countered the claim by observing that christopher columbus was able to sail around the earth without falling off the edge and later, by presenting satellite imagery taken from space of a spherical earth. this example demonstrates that a. it is easy to resolve a scientific argument. b. it is not possible to settle a dispute. c. argumentation is a necessary part of scientific inquiry. d. scientific knowledge is unattainable.

The difference between amphid and plasmid

Chapter 11.1 & 11.2 notes section 11.1 1. every living thing has a set of ? inherited from its parents. 2. after becoming a ? , mendel spent several years studying ? and mathematics at the university of vienna. 3. during sexual reproduction, male and female reproductive cells join, a process known as ? . 4. pea flowers are normally ? , which means that sperm cells in pollen fertilize the egg cells in the ? flowers. 5. when mendel crossed plants with ? characters for the same trait, the resulting offspring had only one of the characters. 6. a ? is a specific characteristic, such as seed color or plant height, that varies from one individual to another. 7. filius and filia are the latin words for ? and ? . 8. the offspring of crosses between parents with different traits are called ? . 9.to mendel's surprise, all of the offspring had the character of only ? of the parents. 10. mendel's first conclusion was that biological inheritance is determined by ? that are ? from one generation to the next. 11. scientist calls the chemical factors that determine traits ? . 12. mendel's second conclusion is the ? . 13. the principle of dominance states that some alleles are ? and others are ? . 14. when mendel allowed the f1 plants to reproduce by self-pollination the traits controlled by ? alleles reappeared in about ? of the f2 plants in each cross.

Which statement best describes the relationship between an allele and a gene? question 1 options: an allele is a variation of a gene that can be expressed as a phenotype. an allele is the part of a gene that attaches to messenger rna molecules. an allele is a segment of a dna molecule that controls replication of a gene.