Eric is creating a timeline of the formation of the solar system. Which of the following formed first?

madreJ [45]

Answer:

Fertilization Follows. During the spring of the female cone's second year, the male and female gametes are ready. The pollen grows a pollen tube, which enters a little hole in the ovule's skin near its basal end, called the micropyle. The tube enters the ovule, and the sperm goes down the tube and into the ovule.

5 0

3 years ago

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Soaps can be produced by using bases to dissolve fats or oils. Ammonia feels slippery or soapy to the touch because ________. Gr

Marta_Voda [28]

Answer:

Ammonia feels slippery or soapy to the touch because it is an [alkaline] base and can dissolve some of the fats and oils in your skin.

Explanation:

The concept alkali refers to salts that contain alkali and alkaline earth metal elements. According to chemists, all alkaline solutions are basic.

Ammonia is an alkaline solution that, when combined with water, it actually makes soap. This base feels slippery to the touch because when it makes contact with all the oils that are naturally present in your skin, it produces soap, making it slippery and soapy.

5 0

3 years ago

Name the two kinds of sex cells and how they are formed.

Irina-Kira [14]

Two types of sex cells are
> Sperm (in males)
> Egg or ovum (in females)

Sperm is produces in the testes.
Ovum or egg is produced in the ovaries.

4 0

3 years ago

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8. Describe a cell which effectively uses diffusion as a means to move materials in and out.

frutty [35]

The alveolus in the human body.

5 0

3 years ago

The trait for medium-sized leaves in iris is determined by the genetic condition PP'. Plants with large leaves are PP, whereas p

loris [4]

Answer:

See the answer below

Explanation:

Medium size leaves genotype = PP'

Large leaves genotype = PP

Small leaves genotype = P'P'

Red flower genotype = RR

Pink flower genotype = RR'

White flower genotype = R'R'

Two plants each with medium-sized leaves (PP') and pink flowers (RR') were crossed.

PP'RR' x PP'RR' (let PP' = Aa and RR' = Bb)

Progeny and expected phenotypes

1 PPRR - large leaves, red flower = 1/16 x 640 = 40 seedlings

2 PPRR' - large leaves, pink flower = 2/16 x 640 = 80 seedlings

2 PP'RR - medium leaves, red flower = 2/16 x 640 = 80 seedlings

4 PP'RR' - medium leaves, pink flower = 4/16 x 640 = 160 seedlings

1 PPR'R' - large leaves, white flower = 1/16 x 640 = 40 seedlings

2 PP'R'R' - medium leaves, white flower = 2/16 x 640 = 80 seedlings

1 P'P'RR - small leaves, red flower = 1/16 x 640 = 40 seedlings

2 P'P'RR' - small leaves, pink flower = 2/16 x 640 = 80 seedlings

1 P'P'R'R' = small leaves, white flower = 1/16 x 640 = 40 seedlings

4 0

3 years ago