Describe how three different organism - human, flatworms and fern obtain the oxygen they need for survival.

you are observing your toddler and she asks for a cookie every 10.0 seconds. how many times per minute is she asking for a cookie (1 min=60s) ?

What economic factor promoted the growth of city states in nothern italy

A single-gene trait that has two alleles and that shows a simple dominant-recessive pattern will result in

Synthesis of one protein cannot take place without the presence of another protein." Is this statement true or false and why

In some specialized cells of eukaryotes, a very high level of gene expression can be achieved when DNA is copied repeatedly without cell division for example, some insect larvae maximize production of salivary proteins by means of this process:

Can energy be transferred from animal to animal

The more stomata the more water loss?

Why does it take a long time to develop a new variety of tomato? A. Changes in traits happen gradually, over many generations. B. Many plants resist change. C. Tomatoes cannot acquire new traits. D. A species cannot change over time.

Select the one true statement. Vacuoles store nutrients, water, and waste in animal cells. Plant cells can have chloroplasts but do not have a cell wall.

Using water more effectively A. Protects the environment B. Causes the loss of natural pollution filters C. Increases with contamination D. All of the above