One biology book calls sponges "tireless natural pumps." why is this a good description of sponges?

Gardner is a left-handed adult. it is most likely that he has a thicker-than-normal:

Why is river water less clear at the mouth than at the source? a. because the mouth is warmer b. because the source is colder c. because the mouth has debris d. because the source is warmer

Fungi are important decomposers in terrestrial ecosystems. Some fungi are able to break down lignin in plants, through the production of an enzyme called lignin peroxidase, something that no other organism can do.

Major signs expected during normal development are known as

Brenda ran a 5 km race. During the race, she began to breathe heavily, and some of her muscles began to burn. Which of these explains why Brenda felt a burning in her muscles during the race? Choose the correct answer.

Coal is used to produce energy. The harmful gases produced by coal are cleaned up by a method which needs a large amount of limestone. Predict and explain the long term effect on the environment of obtaining and using limestone.

True or false two genes may not segregate independently if they are on the same chromosmoe

Blood pressure rises and falls in a pattern corresponding to the phases of the

Immune system cells enter a resting phase after undergoing mitosis. when activated-for example, by an infection-they can reenter the sequence of events in the cell cycle that leads to cell division.

How does a muti-celluar organisms organise