Which of these statements best describes what conservation biologists mean by the 'the rapid loss of biodiversity'?a. Introduced species, such as starlings and zebra mussels, have rapidly expanded their ranges.b. Harvests of marine fishes, such as cod and bluefin tuna, are declining.c. The current species extinction rate is as much as 100 times greater than at any time in the past 100,000 years.d. Many potential medicines are being lost as plant species become extinct.