Suppose a fern fossil is found between layer Y and later x during which time range with fern fossil most likely have formed? A. 2-10 million years ago
B. 10-30 million years ago
C. 30-50 million years ago
D. 50-70 million years ago

Competition occurs between species when

Explain why process 2 is so important to sexual reproduction identify processes 1 and 3 state one difference between the cells produced by process 1 and cells produced by process 3

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat