Which location would best be described as a biodiversity hotspot? A.)A coral reef that has lost a significant number of its species due to water pollution B.)A desert that contains fewer than 10 species of animal per square hectare C.)A grassland that has dried out due to a drought D.)A tropical rainforest that contains hundreds of species of birds and thousands of species of vine

the answer is d. chordata

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.