If a radioactive nuclide has a half-life of 1.3 billion years, and it is determined that a rock contains 50% of its original amount of this nuclide, about how old is the rock?

Beaked whales feed at various depths, but they defecate at the ocean's surface. nitrogen-rich whale feces deposited in surface waters supply nutrients for algae that are eaten by surface-dwelling fishes.

Uma borboleta pousa numa poça de agua sem Afundar diga qual a propriedade da agua ajuda a borboleta nesse caso

Plant cells often have a large membrane-bound sac that is used for storing water and other substances. what is the name of this organelle?

At each replication fork, one new strand of dna is made as one continuous piece. what is this strand of dna called?

What part of a leaf contains all the chemicals necessary for photosynthesis? A. Stoma B. Upper Epidermis C. Chloroplasts D. Cuticle

Can life subsist on anything else but water?

What are the effect of a greater number of cysteine amino acids on the stability of the proteins?

Explain how the nucleolus, ribosomes, endoplasmic reticulum, Golgi apparats function together in protein synthesis.

Which statement is true about the scientific method

what would most likely happen to a person who had a shortage of lactase?