How does Skeletal and Circulatory System relate to one another?

What process can cause water in aquifers to become brackish and unusable for agriculture? A) volcanic activity B) eutrophication C) erosion D) groundwater infiltration

A scientist is investigating how the amount of available water affects plant growth in a rainforest. Although all of Earth's spheres are interconnected, which of Earth's spheres does the scientist's investigation focus on?

Protists and bacteria are grouped into different domains because

Which molecules make up proteins?

Applying Ideas Insect bites hurt because the insect injects a toxin into the victim. When certain kinds of ants bite, they inject a small amount of highly irritating formic acid.

What is hybrid inviability? What is hybrid infertility?

Muscle cells differ from nerve cells mainly because they a. express different genes. b. contain different genes. c. use different genetic codes. d. have unique ribosomes.

The butterflies shown below all belong to the same species, but one of them has inherited a rare mutation for blue wings rather than orange wings. The butterflies feed on nectar from orange flowers, and their color acts as camouflage while they feed.

A normal human karytype has

Cual es el proposito de la nutricio?