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3 years ago

Invasive species always have a negative impact on an ecosystem. True False

Biology

2 answers:

PIT_PIT [208]3 years ago

7 0

This is false not true

Rasek [7]3 years ago

6 0

No, this is false some invasive species help balance out populations but then again it may sway out of control again. Also, not all invasive species have a negative impact on the ecosystem.

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A cell that undergoes either mitosis or meiosis must first replicate it's DNA.

makkiz [27]

Answer: True

Explanation: They need to replicate their DNA so the daughter cells hold the same genetic information when the parent cell divides

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3 years ago

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Plasma membranes are selectively permeable. This means that

kenny6666 [7]

Answer: ONLY CERTAIN SUBSTANCES CAN PASS THROUGH IT

Explanation:

1 only gases and water can pass through it.

2 substances need permission to pass through it.

3 only certain substances can pass through it.

4 substances need carrier molecules to pass through it.

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3 years ago

What are the 7 allergy symptoms?

Gala2k [10]

The following are some signs of an allergic reaction: watery, irritated eyelids. 1) Runny nose 2) Coughing. 3)A blocked nose 4)Rashes 5)Hives (a rash with elevated red spots) (a rash with raised red patches) 6) Stomach pain 7)Vomiting.

How much time may an allergy last?

It can take a couple of hours or ten days. It normally lasts between 12 hours and 3 days. Effects can last for two to four weeks even with treatment.

What allergy is the most severe?

Anaphylaxis, also referred to as anaphylaxis, is the most extreme kind. Individuals with chronic of allergies in their background are more likely to experience allergic reactions.

oral antihistamines. Antihistamines can helps with watery eyes, a stuffy or runny nose, coughing, and itching.

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1 year ago

Vegetable farmers often plant soybeans every few years. Rotating crops breaks up the life cycles of many insect pests, and the s

Flauer [41]

The chemical food source for the soybean plants is A (Sunlight) because once the leaves emerge, it relies on sunlight to photothynsesize to get energy.

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3 years ago

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Given the following cross TtYyRr x TtyyRr (T = tall; t = short Y = yellow; y = green R = round; r = wrinkled), what proportion o

mihalych1998 [28]

Answer:

3/32 ttyyR-

Explanation:

Cross: Tall, Yellow, Rounded individuals with a tall, green, rounded individual

Parentals) TtYyRr x TtyyRr

Gametes) TYR, TyR, TYr, Tyr, tYR, tyR, tYr, tyr (Parent one)

TyR, TyR, Tyr, Tyr, tyR, tyR, tyr, tyr (Parent two)

We need to know what proportion of offspring is expected to be short plants with round, green seeds. So we need to identify the gametes for these traits. The genotypes are:

Shot → tt
Round → RR or Rr
Green → yy

⇒ Parent one can provide gametes tyR and tyr

⇒ Parent two can provide gametes tyR and tyr

(1/8 tyR x 2/8 tyR) + (1/8 tyR x 2/8 tyr) + (1/8 tyr x 2/8 tyR) =

2/64 ttyyRR + 2/64 ttyyRr + 2/64 ttyyRr =

1/32 ttyyRR + 2/32 ttyyRr =

3/32 ttyyR-

4 0

3 years ago