Which of the following marine ecosystems consists of an aphotic zone?

A. The open ocean

B. The coastal ocean

C. The intertidal

D. The wetland

Suppose all the alleles on the left and right chromosomes switched places but kept the same order. Would the organism be different? Why or why not?

In this food chain which organism has a maximum biomass and which organism has the least amount of energy from the sun rice-grasshopper-frog-snake-hawk

Is supercoil bigger then coil

A developing cell that is totipotential is capable of developing into any type of cell in the organism. is totally committed to one cell type for life. cannot divide. is totally developed and will not differentiate.

In a simple spinal reflex, the pathway for an impulse is along a sensory neuron directly to a motor neuron through? A) an effector B) a receptorC) an interneuron D) the brain

G select the true statements about protein secondary structure. the β-pleated sheet is held together by hydrogen bonds between adjacent segments.

What would happen to a cell if the fatty acids in the cell membrane became soluble in water?

When scientists identify the age of a fossil they

In a small population, a random Chang in allele frequency is called

Which charterstic makes the nine amino acids essential