All of the following have only one opening into their digestive system except:

a. corals

b. jellyfish

c. roundworms

d. sea anemones

Of the plates listed, which will receive the highest number of this from the sun's rays when the earth is is positioned as shown below?

A purple flower with an unkown genotype is crossed with a white flower. Determine the genotype of the purple flower if purple P is dominant and white p is ressesive

Which statement best describes what would most likely be observed after 20 minutes?

In an ecological pyramid, what happens to energy, biomass and the number of species as you move up. why?

The soft lining inside of your mouth is an example of

Which route represents the path taken by the European explorer Christopher Columbus? A) 1 B) 2 C) 3 D) 4

Which gas is the most abundant of the trace gases? A. nitrogen B. oxygen C. argon D. carbon dioxide

Describe the central dogma of molecular biology, briefly describe the processes of transcription and translation.

magine that the animal body produced sperm and eggs with mitosis instead of meiosis. What chromosome number would the autosomes of the third generation have if the first generation had four chromosomes

A well supported testable explanation of phenomena that have occurred in the natural world is called