About four or five days after fertilization, a group of cells forms a ball-like structure. What is the name of this structure? A. Heart B. Placenta C. Blastocyst D. Stem Cell

Which characteristic correctly describes the cell membrane according to the fluid mosaic model? A. fixed B. elastic C. rigid D. constant

Modifications to chromatin can affect transcriptional activity by changing the accessibility of DNA to the transcription machinery. The given descriptions are examples of various processes that may or may not cause remodeling of chromatin.

The koala has a dependency relationship with eucalyptus trees. true or false

A substance with a high heat of vaporization is able to contribute to which phenomena? a ice floating b evaporative cooling c rising up in a capillary tube d dissolving substances What characteristics does a liquid need to have in order to rise high

What are the parts or process that can describe an ecosystem? a. chemical changes and flow of energy b. chemical changes and flow of water c. physical changes and flow of energy d. physical changes and flow of water

How do human activities increase the occurrence of species extinction?

Describe Coriolis effect and explain why it affects ocean currents.

If the original cell has 46 chromosomes how can each daughter cell also have 46 chromosomes

In what order does water transition from ocean water to rain water?

Where did pompeii worms get their names from