4. What kind of material is found in the C horizon of a soil profile?

O

clay particles

O mineral and organic matter

O hardpan

O partially weathered parent material

Describe a medical advance that has led to a decrease in the spread of communicable diseases. What is the advance? How does it prevent the spread of disease?

Which statement best explains why compounds have different properties then the elements that form them

Any problem of inquiry can be proved or disproved using the scientific method. True False

What type of environment is ideal for the preservation of a footprint Water Sand Mud Rock

Which is a mechanical vector that injects recombinant DNA directly into the nucleus of a host cell?

According to piaget, at what age will most children enter the concrete operations stage of cognitive development? a. between the ages of 4 and 6 b. usually by age 2 c. by age 12 d. by age 7

When plants wilt, their soft stems and leaves begin to droop. What is going on inside the plants' cells that causes plants to droop like this?

How is evolution seen today

What was Marshall Nirenberg and Heinrich Matthaei's contribution to our current understanding of the genetic code? discovery of codons discovery and extraction of DNA creation of a model of DNA creation of Photo 51

How does pili affect the formation of bacterial colonies?