A few biology questions!! Ask for a biology question, thank you!!

1.Ask the question: What are the environmental conditions in which the rat woman lives?

2.Make an assumption: the rat woman prefers a dark, damp, warm environment.

3.Experimental Validation:

Moist: Half of the carton is covered with wet soil and half with dry soil. Place the rat woman at the junction of wet and dry soil.

Outcome. Temperature: Half of the carton is covered with wet soil, half is covered with ice wet soil, and the rat woman is placed at the junction of wet soil and ice wet soil.

4.Conclusion: The environmental factors affecting the distribution of rat women include soil humidity and temperature. Rat women prefer moist, warm environments.

5.Humidity, temperature. Except for the variables, keep the other conditions consistent.

Ask the question: Temperature can affect the weight of a rat woman.

Make a hypothesis: In a low temperature environment, the rat women who consume the same food gain weight slowly.

Experimental verification: 8 rat women of the same age and similar body shape were divided into two groups, group A was housed at room temperature of 26 degrees (air conditioning controlled temperature), group B was housed at 4 degrees (put into a large-volume refrigerator). They were kept in the same cage in a dark room, fed the same amount and type of feed every day, exposed to fluorescent lamps for 12 hours, and weighed after one month.

It was concluded that too low temperature affected the weight gain of rat women.

The only variable is temperature.

Eight rat women of the same age and similar body shape excluded individual differences. The living space and food are the same, and the large-capacity refrigerator excludes the influence of oxygen content to ensure that its living environment is the same. The darkroom and the same fluorescent lamp illumination time exclude the effects of light.

A right. b

c. No fat.

d Complete hydrolysis, should be the hydrolysate of nucleotides, there are bases, ribose and phosphoric acid.

（1）5

3) (xaxa, xay) (ooblasts) (one or two) (4) gray body with long wings.

Grey-bodied: black-bodied = 1:1 and long-winged: short-winged = 1:1 (species and proportion of gametes) (not located) in lateral offspring

Located in Although the phone can't see the problem clearly, I remember that the exact result of the experiment was located.

aWheat belongs to monocots, and most of the nutrients are found in the endosperm (mainly starch and protein).

A Phaseolus vulgaris is a dicot, but it is also an angiosperm, so they all have seed coats.

c The length of the tree is related to the buds (which form the stems and leaves), and the trunk only grows thicker.

1) Because the thymus is the place where T cells develop and mature, if there is a thymus, T cells will respond to human tumor cells, so it is prudent to study the results of experimental production, so nude mice should be selected.

2) Eliminate the interference of external factors on the experiment.