True or false : mechanical weathering and chemical weathering often work together

Used as evidence for sea-floor spreading

Immunoglobulin, TCR, and MHC proteins share structural features and have evolved by duplication and selection of primordial antigen receptors. A. True. B. False

Which of the following is the function of vacuoles in an animal cell? A. store materials B. make proteins C. convert energy D. break down molecules

What relationships do you observe between the wind patterns and the surface currents?

Two major reactions that take place in photosynthesis

Which food supplies only discretionary kcalories? a. bagel b. peanut butter c. grape jelly d. raisins?

Members of which two domains of life are composed of one or more prokaryotic cells?

What causes autoimmune diseases?

Once you have the Refractive Index of a glass sample, what do you do with it? Combine the elemental values of glass to find the refractive index. Calculate the molecular weight using the periodic table. Look it up in an encyclopedia.

Chromosomes move to the middle of the cell during what phase