A sample of a radioactive element has a mass of 80g. how much parent and daughter materials are in the sample after two half lives?

The external physical appearance of an organism is termed its

What is the tube that stretches from the mouth to the anus called trachea alimentary canal eustachian tube none of the above

Which desert has a wide range of plant life? a. Namib c. Drakensberg b. Okavango d. Kalahari

Scientists claim that global climate change is threatening many species with extinction. Which statement provides the strongest evidence for this claim?

What is the significant role of spore formation in the reproductive cycle of this bacterium?

1pt Blood is made up of A. nutrients, minerals, fats, and proteins B. oxygen, carbon dioxide, and sugar C. plasma, red blood cells, white blood cells, and platelets D. bone marrow cells and water

One of the first breakthroughs in biotechnology was the discovery of the gene that makes insulin. Part of this process involved scientists making DNA to match each possible sequence of insulin mRNA. What was the next step of this process? A.

Which of these modes of transmission require a bodily opening either natural or artificial?

Which factor is a characteristic of an acid? A. Non-corrosive B. Soapy C. Sour D. Slippery

How are unique daughter cells created in meiosis? A. Homologous pairing B. Crossing over C. Mutation during reduction Division D. Zygote fertilization