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12.12.2019 •
Biology
Need
which of the following are true about the paleozoic era?
i. mammals were common on land and in the oceans.
ii. plants appeared on land for the first time.
iii. seed plants were common by the end of the era.
iv. arachnids and insects appeared for the first time.
a.
iii and iv only
b.
ii, iii, and iv only
c.
i, ii, iii, and iv
d.
ii and iii only
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Ответ:
Ответ:
Which of the following statements is true?
-Arteries are thinner and harder than veins.<=WRONG
-The left ventricle controls the heartbeat.<=YOUR ANSWER
-Veins carry blood away from the heart.<=WRONG
-Capillaries connect ateries and veins.<=WRONG