Question

2 Reading Using prior knowledge 10.2.2 10.4.2 What do you know about oxygen? Which of the sentences below are true? Listen, read and check. 1 2 Oxygen powers our bodies. Oxygen is toxic in large amounts. The first life forms needed oxygen to survive. 4 Oxygen is the main product of photosynthesis. 3 5 Animals were smaller in the past because of oxygen. 6 The amount of oxygen in the atmosphere has been constant through time.

Answer 1

Ответ:

1 Oxygen powers our bodies. - True

2 Oxygen is toxic in large amounts. - True

3 The first life forms needed oxygen to survive. - False (they were able to survive without oxygen)

4 Oxygen is the main product of photosynthesis. - False (it's a by-product, not the main one)

5 Animals were smaller in the past because of oxygen. - False (they were much bigger in the past, 300 million years ago)

6 The amount of oxygen in the atmosphere has been constant through time. - False (First, the amount of oxygen increased  steadily, up to 50%,  and then it fell down to just 12%)

Объяснение:

1 Кислород питает наши организмы. - Верно

2 Кислород токсичен в больших количествах.  - Верно

3 Первые формы жизни нуждались в кислороде, чтобы выжить. - Неверно (они могли выжить без кислорода)

4 Кислород – основной продукт фотосинтеза. - Неверно (это побочный продукт, а не основной)

5 В прошлом животные были меньше из-за кислорода. - Неверно (в прошлом, 300 миллионов лет назад, они были намного больше)

6 Количество кислорода в атмосфере остается постоянным во времени. - Неверно (Сначала количество кислорода неуклонно увеличивалось, до 50%, а затем упало всего до 12%)

#SPJ1

Answer 2

Let's go through each of the statements and determine if they are true or false based on the information you provided:

1. "Oxygen powers our bodies."

   • True. Oxygen is essential for respiration, which powers our bodies at the cellular level.

2. "Oxygen is toxic in large amounts."

   • True. Oxygen can be toxic in high concentrations and can lead to a condition called oxygen toxicity.

3. "The first life forms needed oxygen to survive."

   • False. The earliest life forms on Earth were anaerobic, which means they did not require oxygen to survive. Oxygen was actually toxic to these organisms.

4. "Oxygen is the main product of photosynthesis."

   • False. Oxygen is a byproduct of photosynthesis, but the main product is glucose (a type of sugar), which plants use for energy.

5. "Animals were smaller in the past because of oxygen."

   • True. There is a theory known as the "Oxygen hypothesis" that suggests that the size of prehistoric insects and animals may have been limited by the lower oxygen levels in the Earth's atmosphere in the past. Higher oxygen levels might have allowed for larger insects and animals.

6. "The amount of oxygen in the atmosphere has been constant through time."

   • False. The amount of oxygen in Earth's atmosphere has not been constant. It has varied over geological time, and oxygen levels have increased due to processes like photosynthesis by plants and algae.

So, statements 1, 2, 5 are true, while statements 3, 4, and 6 are false.