What atomspheric gas is used by marine organisms to make their shells

In a particular family, one parent has Type A blood, the other has Type B. They have four children. One has Type A, one has Type B, one has Type AB, and the last has Type O. What are the genotypes of all six people in this family?

Imagine a scientist finds the fossils of an extinct Ichthyosaur and finds this morphological similarity of Ichthyosaurs and modern dolphins: bones indicating flippers and a tail for swimming.

Which structure produces the greatest variety of digestive enzymes?

Fungi are called thallophyta? why?

Which of the following best describes a marine climate?

Summarize how movements of tectonic plates have influenced climate and life on earth

What are the three types of chemical bonds

In a pond, algae has 10,000 kcal of available energy. If the zooplankton which consumes the algae has 1,000 kcal of available energy, what is the available energy to the minnows that consume the zooplankton?

Why are the symptoms of vascular neurocognitive disorder so different in each patient?

A mutation in a dna molecule is passed to offspring only when the mutation occurs in a