Air has

a. a fixed volume but no fixed shape.

b. no fixed volume or shape.

c. a fixed shape but no fixed volume.

d. both a fixed shape and fixed volume.

Which structure is the site of nutrient and gas exchange between the mother and a growing fetus? A. placenta B. umbilical cord C. fallopian tube D. uterus

Which of the following is not a characteristic life A, maintains homeostasis B, composed of cells C, composed of atoms D, carries out metabolism if if you get it correct I will name you brainliest

Why adaptation is important in biology?

Why are horses and donkeys considered different species, even though they can produce offspring?

Which of the following is the best example of an ecosystem? A. a nest of mockingbirds, some bullfrogs, a pond, and a sandy shore B. bees and wasps around a group of purple cornflowers C. a school of sunfish

A circular molecule of DNA contains 1 million base pairs. If the DNA synthesis at a replication fork occurs at a rate of 100,000 nucleotides per minute, how much time will theta replication require to completely replicate the molecule, assuming that

Which of the following is true of mitosis? It is also known as cytokinesis. A. It maintains the same chromosome number in the daughter cells as in the parent cell. B. It is the last phase of interphase. C.

An object has a kinetic energy of 32 J and a mass of 36 kg, how fast is the object moving?

In multicellular eukaryotic organisms, the production of new cells follows a highly regulated sequence of growth, DNA replication, and division. This sequence is referred to as the cell ___, which consists of the G1, S, G2, and M phases.

A 210 gram piece of metal has a volume of 81 cm3. What is the density of this metal?