Which of the following statements illustrate how fossils record the evolution of defensive mechanisms over time? which ever one is true right true under it. Fossils after the Precambrian period show evidence of legs and eyes, indicating that the presence of predators stimulated the beginning of animal diversity.

Fossils that are found in cold arctic environments are known to belong to an animal species that once lived in much warmer climates.

Many marine fossils have high contents of silica and calcium, which indicate the use of these materials to encase the bodies of organisms.

Fossil body parts of an animal and its location of excavation confirm that these animal species underwent minimal adaptations from one period to the next.

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.

answer;

c. a tree whose roots are surrounded by wet sand.

explanation;

water stress is an important factor limiting the growth and productivity of forests.water stress is the most often cited cause of poor survival and growth of woody landscape plants.

-insufficient soil moisture is the most common form of water stress, but excess moisture that leads to poor soil aeration (hypoxia) can also result in reduced plant vitality. a tree whose roots are surrounded by wet sand would be least likely to experience water stress.

increases the risk of extinction 

explanation:

the answer is that if the species suffers from the disease, there is nothing stronger than the others, so it is possible to remove wholeness. an example of this is hunger in irish potatoes, which has a deadly disease bearish part of all potato harvest masses. pretty much ruins the land of crops.