The double helix of dna is which level of structure?

a. primary

b. secondary

c. tertiary

d. quaternary

Which organelle converts the chemical energy stored in food into compounds that are easier for the cell to use? a chloroplast b golgi apparatus c mitochondrion d endoplasmic reticulum

Only 10 percent of the energy stored in an organism can be passed on to the next trophic level. of the remaining energy, some is used for the organisms life processes and the rest is ...

Which of the following is an example of chemical weathering? wind breaking a rock into small pieces ice breaking apart cracks in a rock water smoothing a rock in a stream minerals in rock becoming powdery and rusty

When you increase your velocity on a skateboard, it is harder to stop. Which is this an example of?

Is a Caecidotea a vertebrate or an invertebrate animal?

A mother sleeping in the middle of the night nevertheless responds when she hears her 2-year-old daughter crying in the adjacent bedroom. This indicates that the mother possesses:

How can farmers keep topsoil on their land? check all that apply. a. close their gates b. keep plants growing c. plant trees to shield fields from the wind d. do not plow when extremely heavy rains are expected?

Measures how much matter is present in a substance

How is artificial selection similar to natural selection?

Which of these is a distinguishing characteristic of terrestrial habitats? O A. Plant life O B. Presence of oxygen O C. Salinity levels O D. Human presence