Which example is an abiotic factor of an aquarium environment?

1. coral

2. water

3. sunfish

4. bacteria

Which statement about how geologists study the ages of rock layers is true? The law of superposition means that older rocks are on top. Geologists can find the exact age of a rock by looking at its relative position.

Which describes a concept that was not previously known but was developed as a result of mendel's experiments with pea plants?

En qué tipo de organismo se encuentran los eritrocitos?

Carbon, hydrogen, nitrogen and sulphur are elements found in living cells. Which is the least common? A. Carbon B. Hydrogen C. Nitrogen D. Sulphur

Stress can directly undermine health and physical well-being by

What holds DNA and controles cells activities

Usually, a mutation in the promoter region of an operon causes reduced levels of synthesis of the proteins encoded by that operon. Occasionally, a mutation in the promoter region actually causes increased levels of synthesis.

Genes do not exert the only influence on personality. therefore,:

Bats contain brown fat between their shoulder blades. how could this brown fat be an adaptation to torpor?

How many kingdoms are in the modern system of classification?