How are piaget and erikson's theories similar?

both study the emotional development of children.
both relied on freud's foundational work.
both are stage theorists.
all of the above

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

What best discribes the relationship between wavelength and frequency in a electromagnetic wave