In evolutionary history, the first animals to successfully invade land from the sea were an animal with a hard outer skeleton and jointed limbs.

Sammi is studying the interaction of the digestive and circulatory systems in the human body. she has listed various processes that occur in each of the systems. put the processes in order to describe the interaction between these two systems. tiles nutrients diffuse through the villi of the small intestine.digestive processes break nutrients down in the mouth, stomach, and small intestine.blood is pumped through the circulatory system to deliver nutrients to other organs.nutrients are ingested at the mouth.nutrients enter the capillaries of the circulatory system. sequence

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.

Idon’t understand this can someone give me the answer? you