Complex 15. The total amount of living tissue at each tropi
level in an ecosystem can be shown in a(n)
a. energy pyramid
c. biomass pyrami
b. pyramid of numbers. d. biogeochemicals

The seed coat's most important function is to provide a) a nonstressful environment for the megasporangium. b) the means for dispersal. c) dormancy. d) a nutrient supply for the embryo. e) desiccation resistance.

Rue or false siblings look simila rbecause they each have some traits of their parents.

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2