Tessa was recording observations of some items around her classroom. She recorded a physical description of each item, the volum

It would either be the final one or the very first!

Response:

2 & 4

Explanation:

The concept of spontaneous generation proposed that life could arise from 'nothing.' This idea remained accepted until it was challenged by Francesco Redi and Luis Pasteur through experiments. Redi conducted an experiment where he placed cooked meat on two plates—one was covered with a glass bowl, while the other was left exposed. The covered plate did not develop maggots, but the open one did, indicating that maggots resulted from eggs laid by flies. Thus, life originates from pre-existing life.

Answer:

100 units

Explanation:

The parent cell holds 200 units of DNA. During the process of cell division, this amount is distributed between the resulting daughter cells, with each cell obtaining half of the DNA present in the original cell.

As mitosis yields two daughter cells, each one will receive 100 units of DNA.

The answer involves the regulation of activity by higher brain centers. Explanation: The autonomic nervous system, part of the peripheral nervous system, manages involuntary functions that occur without conscious control, such as heart rate and breathing. Conversely, the somatic nervous system is also part of the peripheral nervous system but transmits signals to skeletal muscles and receives stimulus information. While both systems differ, they are not responsible for regulating activity by higher brain centers.

Question continued

For each statement below, indicate "True" if it can be considered a valid hypothesis based solely on these three observations, and mark "False" if it cannot be considered valid.

1. The onion cells I examined contain a nucleus.

2. All onion cells contain a nucleus.

3. Every cell contains a nucleus.

4. Certain cells contain a nucleus.

5. Only onion cells contain a nucleus.

6. If I observe 10 skin cells from my hand, each one will contain a nucleus.

Answer:

1. The onion cells I examined contain a nucleus. false - this represents an observation based on the evidence you have collected.

2. All onion cells contain a nucleus. true - this qualifies as a valid hypothesis derived from your observations of onion cells

3. Every cell contains a nucleus. true  - this serves as a hypothesis since you examined 3 different cell types, taking several samples of each, and discovered they all possess a nucleus

4. Certain cells contain a nucleus. false - this cannot be seen as a valid hypothesis. The current evidence implies that all cells have a nucleus

5. Only onion cells contain a nucleus. - false, as you are aware this is incorrect because other cell types you examined also had a nucleus

6. If I observe 10 skin cells from my hand, each one will contain a nucleus. false - a hypothesis should be a broad principle that is supported by evidence; this statement is overly specific.