Frederick griffith made a scientific discovery in 1928. which best describes
the knowledge about genetics before 1928?
a. scientists did not know how traits were inherited,
b. scientists thought that traits were passed along by dna,
c. scientists thought that only viruses contained dna.
d. scientists did not think that traits were inherited.

Study the picture of the ocean. which is the best example of an organism’s niche shown in the picture? a. the environment contains several of the same species of coral. b. the shallow area of the ocean meets the needs of the coral and the fish. c. the ocean has fish and coral that live in the same area. d. the coral take in food from the water and provide shelter for the fish.

What is one affect on the australian environment due to the introduction of non-native european rabbits? (a) more grass grew in response to the need of the growing population of rabbits. (b) the rabbits balance out the food chain as they became a natural prey to many predators. (c) the rabbits the land by digging, which caused the soil to spread much needed nutrients. (d) the rabbits out-competed other small animals species and caused them to go extinct.

What is the tern used to describe an individual that of a recessive allele that causes disease, but is otherwise healthy? a. carrier b. polycite c. target d. afflicted