Which is the main organ of the excretory system?

a. kidney

b. ureter

c. urethra

d. urinary bladder

In DNA, the total number of guanine bases will be equal to the total number of A.) cytosine bases B.) thymine bases C.) guanine bases D.) deoxyribose sugars

a plant forms new tissue at the tips of its roots and Stems this new tissue growth is a direct result of

How long does it take for a package to come from uk to arizona?

While mRNA stands are being created a sequence is sometimes miscopied. What is the best possible outcome, the worst possible outcome and the long-term effect on the cell if mRNA strands were miscopied?

During which step of meiosis homologous chromosomes pair up? A) prophase 1 B) anaphase 1 B) telophase 1 C) metaphase1

Egg laying land animals have evolved to produce eggs with tough shells to ensure that

Which of the following statements describes a proton of an atom? A has a negative charge and is located in the nucleus. B has no charge and is located in the nucleus C has a positive charge and is located in outer energy levels.

What are reasons scientists use models? To study objects far away To study objects too large To study objects too small. To study objects easily found in a lab. To study events that take place over long periods of time.

1. true false Carbon atoms form the building blocks of most living things.

Inhibiting enzymes involved in cell wall synthesis leads to which of the following? A) cell death by osmotic lysisB) a reduction in protein synthesisC) the incomplete synthesis of the bacterial cell wallD) a reduction in the amount of usable energy