Answer:
C
Explanation:
The cell wall in only present in plant cells, not animal cells. Hence, the fact that plant cells are rectangular while animal cells are more circular.
Answer:
Carries food from the mouth to the stomach.
Explanation:
The esophagus is the tube in which chewed food travels after you swallow. It is directly connected to the mouth and the stomach.
Answer:
When homologous chromosomes form pairs during prophase I of meiosis I, crossing-over can occur. Crossing-over is the exchange of genetic material between homologous chromosomes. ... It results in gametes that have unique combinations of chromosomes. In sexual reproduction, two gametes unite to produce an offspring.
Explanation:
Answer:
A
Explanation:
We do not gain the mass of the food we eat. Therefore, B is wrong. Our cells do not grow in size, they only grow in number. Therefore, C is wrong. Although the puppy's body does, in a way, stretch out, A is a better option. Therefore, D is likely to be wrong.
Answer:
Spiral Galaxies, Elliptical Galaxies & Irregular Galaxies
Explanation:
How did galaxies originate? Astronomers believe that after the big bang, the explosion which began the universe 10 billion to 20 billion years ago, gravity began to compress masses of free-floating gas. Two main theories, bottom-up and top-down, explain what happened next. According to bottom-up theories, clusters began to form and assembled together into the larger units we know as galaxies. Top-down theories suggest that galaxies formed first, and the stars and other objects within them were subsequently produced. They categorized different galaxies to maintain their tests from the other galaxies.
