Scientists hypothesize that oxygen began to accumulate in Earth's atmosphere after the appearance of living things with the ability to

Which two processes result in variations in sexually reproducing species? (1) mutation and genetic recombination (2) mitosis and natural selection (3) extinction and gene replacement (4) selective breeding and cloning

Body defenses that respond to generalized tissue damage and many common pathogens are referred to as

Biotic means living and abiotic means non-living. Which is an example of each listed in the same order as biotic and abiotic? a. sea sponge and sea star (star fish) b. rock and moon c. moss and owl d. tree and car

How many amino acids can a sequence of 24 DNA bases code for?

What product produced by yeast cells during fermentation causes bread to rise? lactic acid carbon dioxide glucose ethyl alcohol

What are somatic cells

What type of bacteria causes environmental change

Contrast a food chain with a food web, and include the total % of energy which is conserved between each level of a food chain

What happens when the lungs recoil? A. Inspiration occurs. B. Internal respiration occurs. C. Ribs and diaphragm muscles contract. D. Expiration occurs.

Which of these is NOT a reproductive isolating mechanism? geographic temporal behavioral all of these are reproductive isolating mechanisms