Aspirin (acetylsalicylic acid, c9h8o4) is a weak monoprotic acid. To determine its acid-dissociation constant, a student dissolved 2. 00 g of aspirin in 0. 600 l of water and measured the ph. What was the ka value calculated by the student if the ph of the solution was 2. 62?.

The different forms of a gene for a given trait are called .

An ecosystem is shown in the illustration. assume that human activities have led to a decrease in the number of eagles. a virus attack on rabbits has led to a decrease in their population in the ecosystem. which two sentences describe likely effects on the ecosystem? 1. there’s an increase in the number of snakes and insects and a decrease in the number of frogs. 2. there’s an increase in the number of snakes and insects, and the storks face increased competition for food. 3. there’s an increase in the number of storks and a decrease in the number of snakes and insects. 4. there’s an increase in the number of frogs and a decrease in the number of storks and insects. 5. there’s a decrease in the number of snakes, insects, and frogs.

Scientists observed a rock stratum with fossil. if mollusks evolved before arthropod, where will their fossils be found.