Which characteristic is shared by all mollusks and echinoderms? O live only in salt water
O lack a backbone
O use tube feet to move
O have an open circulatory system

Only have 1 hour left

Every early childhood education program should develop a

The serengeti plains are part of the african savanna ecosystem and are home to a variety of different species of plants and animals. the serengeti plains experience a seven-month period of seasonal drought each year, during which the ecosystem receives only four inches of rain and the availability of some resources becomes very scarce. which type of limiting factors does the seasonal drought in the serengeti plains affect?

As a result of climate change earths temperature is rising and sea ice is melting what is a likely effect? answer : populations of walruses and polar bears will decline