Explain why humans can be at different trophic levels on different food chains, but they can never occupy the lowest trophic level.

Which method is the best way to determine an ecosystems biodiversity? A. Weigh all the species, and measure their total biomas. B. Locate the keystone species, and identify any species that depends on it. C.

All chordates share a set of derived characters during at least some part of their life. drag the labels to their correct locations on the diagram of chordate characters below. use blue labels for blue targets and pink labels for pink targets.

Hydrogen can be obtained economically as a bi-product in the electrolysis of

The difference between incomplete dominance and codominance is: a. that in incomplete dominance, the trait under observation is produced by the combination of multiple alleles, while in codominance, the trait is produced by a single allele. b.

Evolution and Natural Selection

How do substances move in passive transport?

Atmosphere: is mostly made of nitrogen is weightless protects earth from harmful radiation contains water vapor is affected by events in the hydrosphere

According to this species-area curve for reptiles and amphibians on a west indian archipelago, a 50% decrease in area will change the number of species living in the remaining area by

How do organelles interact within a cell

How do we detect the energy of a wavelength?