Why are valves found in veins, but not in capillaries or arteries?

Lithium has 3 electrons. why do 2 electrons go in the first shell, and one in the second? A) The electrons go randomly into shells. B) The first shell only holds 2 electrons so the 3rd electron had to go in the second shell.

How does energy change as it moves through the ecosystem?

Which of these factors is associated with sustainable farming? A. Desertification B. Monoculture C. Intensive farming D. Food security

What is 96,989,200 written in scientific notation?

Why are scientists unable to find nucleotides in water?

Pairing of homologous chromosomes in prophase of meiosis I appears to be critical for proper alignment, crossing over, and subsequent separation. This pairing is facilitated by the sharing of sequence homology between homologous chromosomes.

What does "leeward" mean?

Which lipid acts as a chemical messenger? a. adipose tissue b. cholesterol c. testosterone d. beeswax

The degradation of alanine yields pyruvate and the degradation of leucine yields acetyl coa. can the degradation of each of these amino acids directly replenish the pool of tca intermediates? explain why or why not.

How does the Arthropod growth curve differ from the growth curve of most other animals?