What organ acts like a filter to clean-up the blood?

pancreas
heart
liver
kidney

Babies with very low or very high weight are less likely to survive .

Out of the seven main animal groups (fish, mammals, birds, insects, reptiles, amphibians, and arachnids), how many contain members with internal backbones? a. 5 b. 3 c. 7 d. 1

To sciences do not agree on which type of grocery bag is better for the environment what is most likely to come out come out of the disagreement