Why are there so many different species on Earth today?

What is radiometric dating?

How do trees act as carbon sinks? a. They take in carbon during the process of photosynthesis. b. Carbon is stored in their tissue. c. They remove carbon dioxide from the atmosphere. d. All of the above

Which of the following is not a large biomolecule? Select one: a. Lipid b. Carbohydrate c. Nucleic Acid d. Ice

Which does not describe a physical change happening to water? water evaporating in the sun water reacting with nitrogen gas water freezing and being broken apart with a knife water heating up on a stove

Which source causes the skin to warm up when a person stands in the sunlight on a hot summer day UV light microwaves radio waves infrared light

In pea plants, smooth pea shape is dominant to wrinkled pea shape. If a pea plant that is true-breeding for smooth pea shape is crossed with a pea plant that is true-breeding for wrinkled pea shape, what will be true of the offspring?

Are atoms completely lost or gain in a chemical re

Epinephrine and norepinephrine that are released from the adrenal glands affect target tissue for a longer period of time than the same substances released from neurons at their peripheral receptors. why?

Interpret this phrase: "we respire because our cells respire"

What are the two reasons for the change in the population of the giraffes?