Which statement correctly describes the human muscular system
a. muscles of the body can pull and push
b. skeletal muscles often form in hollow internal structures
c. the smooth and cardiac muscles operate involuntarily
d. each bone is attached to one muscle

The phylogenetic tree illustrates the relationship between humans and our closest living relatives. the tree was based on biochemical comparisons, including dna and amino acid sequences. according to the biomolecular data, we could infer that

The ancestors of plants that lived in water had plenty of water for the young. angiosperms are a group of land plants that evolved a reproductive trait for living on land. this trait protect young plants by allowing them to grow only when water is present and the conditions for healthy development are right. what trait most likely young angiosperms in this way?

What are the ingredients of oobleck?