Investigate sea otters helped scientists identify a decline in the population. This, in turn, led to efforts to protect the sea otters and work to ensure that the population growths. 1.What metods might scientists have used to study the sea otters population in California?

2.How could these methods have helped identify a problem with the sea otter population?(explain).

Which element provides strength to the exoskeleton of clams and oysters

One gene can influence trait(s). one trait can be determined by gene(s).

Hydrilla (hydrilla verticillata) is an invasive aquatic plant and one of the most serious aquatic pests in florida. hydrilla has already been introduced to hundreds of bodies of water throughout florida, hydrilla is difficult to control because it grows rapidly and survives in many different water depths and conditions. hydrilla • describe how hydrilla affects native plant and animal species. include both a biotic and an abiotic limiting factor. • suggest one biotic and one abiotic recommendation that could slow the spread of hydrilla