Which trait, dominant or recessive, will be expressed if an organism has one dominant allele and one recessive allele? A) Only the dominant trait will be expressed.
B) The organism will lack the trait completely.
C) Only the recessive trait will be expressed.
D) Both the dominant and recessive traits will be expressed.

6. in the dna double helix, how are the two strands of dna held together? a. chemical bonds between base pairs hold the two strands of dna together. b. hydrogen bonds between the base pairs hold the two strands of dna together. c. hydrogen bonds between sugar groups and phosphate groups hold the two strands of dna together. d. chemical bonds between sugar groups and phosphate groups hold the two strands of dna together.

The images show fossils of a modern bird and two extinct organisms (a tyrannosaurus rex and an archaeopteryx). based on the structure of the three organisms, it can be concluded that . the archaeopteryx and bird have wings, while dinosaurs have limbs. so, it can be concluded that .

Match the types of competition to their descriptions.