What was scientists' understanding of cryptic species?

A．They occurred in equal numbers in all biogeographical regions.

B．They were mostly found in insects and reptiles.

C．They were likely to be in tropical rather than temperate regions.

D．Both Ｂ and Ｃ.

[单选题]What is the researchers' understanding of tbe New Zealand study results?A． Poorly motivated 26-year-olds watch more TV.B． Habits of TV watching reduce learning interestC． TV watching leads to lower education levels of the 15-year-olds.D． The connect

[单选题]Scientists workingon a problem do not know and sometimes can't even guess w

[单选题]Scientists workingon a problem do not know and sometimes can't even guess w

[单选题]Scientists workingon a problem do not know and sometimes can't even guess w

[单选题]Scientists workingon a problem do not know and sometimes can't even guess w

[单选题]Scientists workingon a problem do not know and sometimes can't even guess w

[单选题]What will scientists do to make sure the poison works this time?A． They will try some of it themselves.B． They will use a special kind of poison.C． They will drain the lake first.D． They will only put the poison in the wells.

[单选题]What did scientists learn about earthquakes at the Rocky Mountain Arsenal?A．) They occur at about 4,000 metres below ground level.B．) The injection of water into earthquake faults prevents earthquakes from occurring.C．) They are usually caused by the

[单选题]What did the scientists do to find out if the e-nose worked?A． They presented it with all common crops..B． They fixed 13 sensors inside the device.C． They collected different damaged leaves.D． They made tests on damaged and healthy leaves.

[单选题]Scientists doubt whether it's______to regulate one's biological clock by drinking.A．feasibleB．incredibleC．fashionableD．valuable