What circumstances could make it hard for scientist to gather information about lost species? what can they do to overcome these issues

There are many circumstances that scientists face and there are many ways to overcome these issues.

Explanation:

There are around 14,00 species that are endangered as of now. The main reasons for their extinction is either loss of habitat and loss of genetic variation. As human population increases, natural resources keep reducing as a result, species gradually become endangered. Poaching also significantly contributes to endangering of these species.

Scientists face a lot of problems to find information about such species. First of all, problem is to find such organisms as they are so rare. Scientists may make the issue of endangering species worse by making the poachers more visible to the species.  

To overcome these issues, scientists come up with many unique and creative steps, use latest technologies like use of drones to locate these hard finding issues and camera traps.

do yall know the answer?

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.